Those of us who live in New York live this truth on a daily basis.
Sometimes, you just meet a person who isn't quite all there. It's hard to tell at first, but then you talk with them for a little while and it just becomes abundantly clear if they're two eggs short of an omelette.
The stories of how you find out are so interesting. But yet, they teach us to look for clues when we interact with others.
Here were some of the answers.