Common sense is not common. We all know that.
But what we probably did not know is that common sense can actually also be incorrect. Your gut feeling might not be the best thing to follow in a given moment.
Or else, you might just have your common sense straight up wrong. But regardless of that, you follow it, and end up flat on your face.
u/VigilantMike asked:
What "common sense" is actually wrong?
Here were some of the answers.
The Opposite Of Natural
You hold your breath if you run out of air while scuba diving.
Wrong, your lungs will explode as you'll float upwards with a lungful of air (and you probably will try to surface anyway) and the air inside them expands.
The proper procedure is to scream all the way up to make sure your airways are open. AaaaaAaaaAaaaAAAaaaAAAA
Go Further In
When I worked in spectator event safety, we learned (sport stadia) that when an evacuation is happening, the safest place to go to is the playing field. As it is usually open air and therefore low risk if it is a fire evacuation.
However common sense takes over crowd dynamics and people try leaving the way they came in (from the other side of the building), so this common sense trait results in thousands of people flocking into burning buildings.
An example of this was the Bradford City stadium fire, a huge chunk of the crowd headed back into the burning stadium looking for exits despite open air (the pitch) being metres in front of them.
Healthy Practice
"Don't go to bed angry"
Umm... me and my husband ignoring this rule has saved our marriage. Do you know how many stupid fights are caused by being tired?
Act Faster
Do not, EVER, wait 24 hours before filing a missing persons report. If you have a reasonable suspicion that something happened to someone, call immediately!
I have to say that this was eye-opening for me too. When my elderly dad didn't return for hours from what was supposed to be a routine jogging exercise on a very hot day, I called the police. They IMMEDIATELY filed a missing persons report so that a patrol car could start looking for him.
He was ok. He'd just gotten lost.
Despite all the bad press coverage these days about misbehaving police, I love our local police force. They do it how EVERYONE should do it. Someone who you can rely on in times of need, rather than an enemy to be feared.
Dentist Tips
The harder you brush the cleaner your teeth get. All you're gonna do is cause gum recession.
EDIT: I guess this is a good platform to share dental hygiene tips. Brush with a soft bristle brush for 2-3 minutes. Don't do side-to-side motion - make small circles on the surfaces of the teeth, flick away from the gum line with short strokes, and vibrate the toothbrush near the gum line at a 45 degree angle from the tooth. Electric toothbrushes are great - they're less technique sensitive and you just hold it over a tooth for 5-10 seconds without back and forth motion. Don't stick your toothbrush near your toilet for obvious (yet never thought about) reasons.
Don't Solidify The Grease
Running hot water to pour grease down the sink drain. That water always cools eventually, and usually the same distance down the drain, where it solidifies, creating a blockage. Although IT'S BEST TO NEVER PUT GREASE DOWN THE DRAIN, if you run cold water, and run the garbage disposal, the grease will solidify when it hits the cold water, the disposal will chop it into tiny pieces, and it will float down the line, creating no blockage.
Nobody Likes To Be Hangry
That people are good eye witnesses.
We aren't. Our perception of things sucks. We are prone to so many biases that we aren't even aware of. If I grade papers on an empty stomach, I will grade them lower than if I am not hungry.
And I will never admit that to be true. Even though it is.
New Nutrition!
A lot of nutrition "common sense" is based on nothing, and/or has never been proven. I chalk it up to the fact that the human body is more adaptable than anyone gives it credit for, and that goes for diet as well as a lot of other things. That, and people think they can find solutions through dietary inclusions/exclusions, or they look toward those things as something to blame health problems on.
Massachusetts Drivers, Take Note
When you see an emergency vehicle with sirens on behind you, you should always slow down and move to the lane or shoulder to your right.
This is exactly what you should do on city roads, but on the highway, you should never brake for an emergency vehicle unless they're pulling you over or you're slowing for a stopped vehicle. Braking in front of an ambulance just slows them down and creates traffic jams. Maintain your speed and get your signal on and merge as soon as you can. And for God's sakes, stop slamming on your brakes to avoid a speeding ticket when you see a cop. Just take your lead foot off the gas and slow naturally. Driving with y'all is scary.
Long Term Investments
"If you're in a relationship but develop feelings for someone else, break up with them because if you truly loved them, you wouldn't love the second person"
Bull sh*t. Don't cheat, don't have an emotional affair, but figure out what's going on in your heart and your head before throwing away a loving relationship over a crush. One size does not fit all
Editing to include some good points of clarification made by other peeps: the point of this post is to say that before you started dating your SO, you had a crush on them. You didn't know where it was going, but you started dating to find out, and it turned into a relationship. Interest is not the same as a relationship. But it's totally possible to have interest in people even when you're in a relationship, and it doesn't mean you should 100% end the relationship when this happens, because it could mean literally nothing. That's for you to decide.
Also talking to your partner is important. That's what I did when it became too confusing, and I wish I'd talked to them sooner. They're human too (right? Or aliens, I don't know you) and even if they haven't experienced it, they should understand it.
Yes, it sucks to be the SO in this situation, but it would suck more if you insisted your girlfriend of 2 years leave you because she thinks the new guy at work is cute.
What you do about your feelings is vastly more important than your feelings themselves.
Also, just so I stop getting this comment: polyamorous relationships are a thing.

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The Mandela effect is when multiple people share the same, incorrect memory.
Its name stems from when paranormal researcher Fiona Broome falsely believed that the future president of South Africa, Nelson Mandela, died in prison in the 1980s.
A false memory she shared with a number of others.
Our memories have been known to deceive us, as we might frequently forget someone's name or one of our numerous online passwords.
But when we share a memory that turns out to be false with many others, convincing ourselves it wasn't the truth can be a very difficult ordeal indeed.
Redditor Mysterious_Boat_1701 was curious to hear people's most unsettling experiences with the Mandela Effect, leading them to ask:
"Which Mandela effect freaks you out the most and why?"
A mysterious gym
"Just had one personally."
"Went to a mall where there was supposedly a gym, asked around and nobody that worked at the mall knew what I was talking about."
"Looked around and couldn't find it."
"Come back a few months later and it’s right there in front of my face, you'd have to be strung out to not notice it."
"idk how or when it just appeared but it freaked me out."- prex320278
A "fruit"ful logo.
"That the fruit of the loom logo never had a cornucopia."
"What’s crazy about that one is that someone emailed the creator of the logo about it and he said even he remembers it having one."- mrcock2·
Less well intentioned than they thought.
"I Mandela effected my whole family once."
"Years ago there was a football player on a rival team that always did a dumb celebration after he got a sack and my family and I always hated it."
"One night after he did it my family started trashing the celebration and I said as a joke 'we are all going to feel terrible when we find out he is doing that celebration as a request from a make-a-wish kid'."
"Fast forward to years later and our team is playing that team again."
"The player got a sack and did the celebration."
"I rolled my eyes and said 'I hate that celebration so much' my mom instantly turned and said 'don't say that, he is doing it for a sick kid'."
"'I actually like it."
"So I was like 'what?'"
"'No there is no sick kid', my whole family then proceeded to argue with me'."
"They all vividly remembered reading articles about it, seeing special report segments before games about it, and other information."
"Some of them even thought they knew the disease the kid had and even extra details about why the kid chose that specific celebration."
"They all had these shared memories that they were sure were true."
"I was floored by all this and insisted none of that was true."
"So we looked it up.'
"Not true."
'No kid like that ever existed.'
"They still have trouble wrapping their heads around this one."
"Turned out human memory is not near as reliable as we think"
"It was American Football and the player was Jared Allen of the Minnesota Vikings and his cattle roping sack celebration."
"This was maybe 10 years ago."- AUSpartan37
His eyesight was better than we thought.
"Mr. Monopoly's monocle."- Additional_Day9903
It's not easy being green.
"I have a personal one that to this day a decade later still destroys my mind."
"I had an old(ish) 2001 dodge neon."
"With BLACK SEATS.'
"I drove this car for years and years, like 80,000 miles.'
'All through college."
"I took work breaks in my car, commuted hours every day total, to college and then the opposite direction to work and back."
"I even lived out of this thing on several occasions.'
'The day I go and trade it in, I'm pulling misc things out of the car at the dealer."
'And the seats are GREEN."
"Not even a little."
'Like very unmistakably GREEN."
"In my black Neon, with black interior, that ALWAYS HAD BLACK SEATS."
"My girlfriend then, wife now, goes oh they've always been green."
"EXCEPT THEY F*CKING WEREN'T DON'T LIE TO ME."
"This is still upsetting to this day..... life is a lie and nothing is real."- ZakuLegion
An urban legend was born.
"Not a global one, just a family thing."
"Back in 2002 my grandma had her 60th birthday, my father took us home at 10.00pm, ready for bed."
"We, me and brother, were 12 and 14 at this time."
'All went well."
"Over the years, a story was made up that we went missing after visiting the local playground after dinner at said grandma's birthday party."
"Some neighbors help to search us, the whole train of 'missing children in a smal village'-thing."
"Fun fact: we never went missing."
"Dad brought us home, put on 'Toy Story' on tv and left."
"My brother and I heard first about this in 2015.'
"From different people on different occasions."
"'Ah your one of the missing boys'."
"I first thought they were mocking me for a different event.'
"I got lost, but it was 2013, alcohol inflicted, different story."
"But then they ALL tell us the same story about us going missing."
'And the stories are damn close to 'true' in every story my mum is driving around the same neighbors to different locations to search, old wine yard, old mill etc."
"Sometimes I think I got lost on the most brutal way."
"I was lost and changed this plane of existence with another one."
"It sometimes made me think about my whole life."- tjorben123
Memories are a fascinating thing.
They can be changed or altered with even the tiniest suggestion.
And making the truth seem less believable than lies.
One last time. One last meal.
How do you chose a last meal?
Let's hope we never have to find out.
People on death row get that option.
Do they deserve it?
Whose to say?
But they have it.
A steak. A pizza... Burger King.
The food world is their oyster.
Oyster. Also an option.
The menu is endless...
Redditor No-Caterpillar4212 wanted to know what our menu choices would be if we faced the end. They asked:
"You're on a death row, you have one hour left, they ask for your final meal - what is it?"
I'd want 2 hours in a Golden Coral with a bar. Covers it all.
Years
"I want a nice filet mignon, medium rare, a baked potato with everything on it, and a nice Cabernet from a good year - I'm thinking 2135."
cleon42
"'Sorry, we couldn't get the Cabernet from 2135. So instead of what could have been a great wine request from a more plausible period of time, you get this crappy stuff we sourced from Wal-Mart. Enjoy your meal, I hope that maintaining your sense of humor was worth it."'
Until_Morning
Take Me
"Something badly cooked so I will be sick and want to die sooner and have diarrhea so bad it will be a last revenge!"
ratchet0101
"Taco bell it is!"
No-Caterpillar4212
"If Taco Bell makes you poop a lot, it's a sign that you probably need more fiber in your diet."
RDAwesome
The Yuck Factor
"A huge bowl of baked beans, a bowl of shredded wheat, a six egg omelette, and a gallon of apple cider. I'm gonna make it awful for everyone."
"Save yourself the hassle of eating all that, just ask for one pack of sugar free Haribo gummy bears. Should make for an interesting time for the folks watching you die."
MamaSweeney24
"You void your bowels when you die too so that should be lovely."
IDontControlTheFood
Perfect
"Fried chicken with some Fanta."
Aggravating-Year-776
Fried chicken is on the top of everyone's list!
Details
"150mg of MDMA. I’m dying happy."
W0nderfu1W0nder
"This should absolutely be allowed. If our leaders insist on the practice of capital punishment then the condemned should be able to ingest any substance they damn please."
forewontoi
Broken
"McFlurry. Those machine are always broken. I just bought myself some time."
Curiousuk_South9566
"Is this like an American thing? I worked at a McDonald's in Denmark once and our machine was never once broken when i was there."
oliv111
"I saw a video about this once. I'm a little fuzzy on the details but I think it has something to do with the contract that was signed in America. Only one company is allowed to do maintenance on the machines and they basically lock out if it's cleaned incorrectly. It's a crap system."
grilled-pbj
Sorry
"Cabbage!! Add some cabbage. I don’t know if an hour if enough to take effect but there was an old coworker on a cabbage diet. Omg she smelled, like it was coming out of her pores. She knew she smelled and kept apologizing and reminding us of the diet."
ImStillaPrick
The OG Always
"Olive Garden. Unlimited soup and breadsticks."
thegodfaubel
"I saw a sketch once, can't remember who it 2qs from. But a an inmate ordered the all you can eat buffet and had been eating for like 8 years. He's constantly on the toilet and takes micro-naps between bites."
KingOfTheGoobers
"Unlimited for 1 hour. Cool."
anticlockclock
How Golden
"If my grandma is still alive her potato soup and cheesecake. Hopefully I'd be able to cook said meal with her one last time."
ATLAS_IS_LOST
Let's hope none of us has to make this decision.
Most people have friends they've been close to for most of their lives.
But at the same time, friends evolve, and everyone finds themselves losing touch with any number of people they at one point considered their friends over time.
Most of the time, this isn't intentional, but just simply happens.
On rare occasions though, people might realize that their friends were not exactly who they thought they were, and didn't like who they revealed themselves to be.
Redditor One-Refrigerator69 was curious to hear stories of people who realized their friends were not exactly the nicest people to be around, leading them to ask:
"When was the moment you realized that your friends are assholes?"
Compared to others...
"When I started hanging out with better people."- Darklink326
All it took was getting my life together
"When I quit drinking ‘cos it was killing me."
"There were people I literally saw every single day who just disappeared as if by magic."
"12 years ago this week, as it happens."
"I’m not anti-drink, far from it."
"Some people, me included, just can’t enjoy it without it becoming a problem."
"Everyone is different."- bigdaftgeordie
A little perspective goes a long way.
"After I realized that other people don't sh*t on each other on every possible occasion in their circle."
"And that it isn't right when a 'friend' uses every known insecurity as an argument against you when you do not behave the way he/she would want you to."- ViscousPlateman
Lack of respect for other people's things
"I let my friend borrow my ps2 when I went to boot camp."
"When I came back, he said he sold it and gave me $50 I think?"
"This was in 2006."- madmike-86
Lack of mutual respect
"When he does sh*t to me and acts like it’s no big deal, then I do the same back and he gets offended."- Primary-Maybe-2749·
Constantly being taken advantage of.
"They only bothered with me when it suited them."
"I'd rather have nobody than have to deal with that."- zombi33mj
When they literally revealed themselves to be criminals
"When they robbed me at gunpoint."- Ok_Student8032
When they stopped liking them after a change of situation
"Fourth grade, when my parents economical situation went downhill and suddenly no one invited me to their birthday party."
"Until Seven years later no one had never invited me to their birthday, or to anything at all actually."- Justalittletoserious
Not being able to get a word in...
"When they tell me to shut up when I say anything."- the_golden_cheese
Violently playing with emotions
"She got a boyfriend and would let him listen to our phone calls and not tell me, even if I was crying about personal stuff that I would only ever tell her."
"Then they both started lying to me about my crush liking me back, forcing both him and me into awkward positions, telling everyone we liked each other so they'd play along, swapping places constantly to make us sit next to each other, pressuring him into giving me a lap dance, making him kiss the prettiest girl in the room, etc, and encouraged me to shoot my shot more and more."
"All the while they knew he didn't like me, he had told them both directly."
"One night I was crying on the phone cause I was so confused why my advances weren't working, and they just kept explaining it away, blaming some other bullsh*t reason and telling me to try again."
"The next day they told me they were laughing throughout the whole call, because I didn't get it and I was so upset."
"I should add I had no dating experience at all and nobody had ever liked me at this point."- Juliemj
It's always sad when our friends disappoint us.
But when our friends proved to be completely different people than we thought they were, it can be devastating.
As the saying goes, one never truly knows who their friends are.
When visiting any foreign country, one should always be familiar with the laws and customs of the land.
After all, what might be generally accepted on your home turf, might be frowned upon, if not illegal, elsewhere.
For that matter, even locals might need a refresher course on what they can and can't do while at home.
A recent Redditor was curious to hear what tourists and locals alike should avoid doing in the USA, leading them to ask:
"In the United States, what should you never do?"
Stay out of the skies!
"Don't fly a drone in Washington, DC."
"The whole D.C. Area is a no fly zone."
"It's a federal offense."
"Just don't do it."- PeytonCarrK
Cops can't be bribed.
"Don't try to bribe cops when you get pulled over."
"I had some Argentinian friends immediately pull out their wallets and start pooling their cash when they got pulled over once.'
"Fortunately someone in the car noticed and told them to put it away immediately."- PeytonCarrK
"Don't pay off the police."
"My dad has friends from several third-world nations where it is common practice to give the police some cash when you are pulled over."
"However, if you try to bribe a police officer here, you'll get into a lot of trouble."- JohnASmiley
Know your rights.
"Everyone, including foreigners, has the right to be silent and have a lawyer when being questioned."
"Don’t say anything."
"Also, even if you speak English fairly well, ask for an interpreter."- WickedLilThing
Enjoy all that nature has to offer... carefully!
"Don't wander off in the national parks."
"It's very real wilderness and you can get lost and die out there."
"This includes going over railings you aren't supposed to, or off trails."
"People have died accidentally falling into a steam geyser that looked like normal water, mauled by animals or left to the elements."- AlphaOhmega
Allow plenty of time!
"Expect consistency at TSA in airports."- WickedLilThing
Some terminology doesn't translate...
"If you’re from England, they’re called cigarettes here."- Yung_Onions
Make sure your license is up to date.
"If you come from a walkable country don’t come here expecting the same."
"There are some areas with good public transportation and bicycle/pedestrian friendly streets but for the most part, especially outside of cities, the areas are designed to accommodate cars more than anything else."
"The reason a lot of Americans drive everywhere is because, depending on where you live, we have no choice."- The_Cars93
Wait for instructions.
"Get out of your car and approach the cop when being stopped by a cop unless told to."- hildrash
Whether your'e waling down a street in a foreign country, or the street you've lived on for your entire life, it's always wise to be on guard and aware of your surroundings.
Not to mention, obey the law.