I know a friend who sold pickles laced with vodka in high school.

She made a killing.

Mixtures

"Used to crush up warheads and mix them with sugar. Sold them by the straw with the ends melted. .50 a piece."

timelydemise13

'you got the goods?'

"I used to deal in whiteboard markers for teachers in high school. One teacher had a tendency to hoard them, leaving none for other teachers. I would take markers from him and provide them to other teachers in need."

"While there was no formal payment, I was given a little bit more leniency at times (e. g. Requests to leave the classroom for a moment etc)."

"Once the marker would start squealing on the whiteboard because it was almost empty, I'd get teachers giving me a nod as if to say 'you got the goods?' I'd then supply them with the marker color of their choosing (usually black)."

"It was actually a lot of fun, and I never heard teachers talk about my systems or chastise me for taking markers."

stoic4somethings

An Unfair Edge

"I was in elementary school when pogs were big. Everyone had cool slammers and stuff but I didn't have money for good ones. My dad made one out of 1/2' mild steel for me and used an engraving pen to make a simple pattern. Everyone was asking me where I got them from."

"I didn't wanna lose my unfair edge but i also knew i could make money. My dad had a big sheet of this 1/2' steel. I told them I was the only one who could get them. I sold them for 15 bucks a pop. My dad kept 10 I got 5. And thats when I learned what overhead was."

FNC1A1

Dress Code

"I went to a private high school with a strict dress code, ties, belt, etc. So I bought a bunch of ties and belts from a thrift store and ran a lucrative rental business out of my locker."

ccrawsh

"If you forgot your gym uniform more than once, you would get fined $5 to rent a uniform from the teacher or serve a detention. I would buy an extra set in the beginning of the school year of each size, and then rent them out/wash them myself undercutting the teachers 'fine' at a cost of $3. Very lucrative over my middle and high school years."

exorthderp

Got Pepsi?

"I used to sell coke (the drink) because they didn't allow fizzy drinks to be brought in."

Seventy0

Everyone loves a good fizz...

Copy-Sell

"The only guy in the school who's family had proper TV channels used to tape wrestling events and rent them out."

221

Knock-Offs

"I have family in NY and would go visit a couple times a year back in high school. Every once in a while we'd visit Chinatown in NYC and I'd end up buying $100s worth of fake watches (Rolex, Tag, Gucci, etc) return to school and sell them for double than what I paid for them."

firkin_slang_whanger

"A lot of people still do this. They fly off to China, buy cheap knock-offs and sell them for a huge mark-up wherever they’re from. It’s big business here in the Philippines."

Mist3rTryHard

Currency

"My school used the metallic ends of pencils as a currency. Bronze was rarest, so it was the most expensive. Green was most common, so it was the least. We traded for erasers or pencil cases or a spot up in the four square line. Eventually got banned but we still operated with people acting as banks to keep the currency hidden and to keep transactions hidden."

Flavory_Boat50

Deals

"Pokemon cards we would hide under playground equipment and trade them because the teachers would take them if they saw them. So we always set up 'deals' in class and created a whole Pokemon card trading network."

immapengoon

"We did something similar in my school. We also bet cards on matches. That got shut down pretty quick. We didn't see anything wrong with it at the time. Ahhh, those were the days."

an_elaborate_prank

Bag Full

"At my school they too all sweets out of the vending machines and replaced them with healthy snacks."

"In the local town there was a sweet shop where you could buy a kilo of mixed sweets for £5, so every week I would go there and buy £1 of small paper bags and spend the Sunday night before school repackaging them all ready for the week ahead."

"Come Monday I would go into school and load my bag up every day selling the bags for 50p."

HeisenbergCooks

Kids are shady, yet diligent.

What kind of sneaky operations did your school have? Let us know in the comment below.