A few days ago, I was in class learning about food from my employee, Mark.
Mark : If someone is trying to cheat you, and you are getting angry, you can say, "[DON'T TRY TO CHEAT ME! I'M NOT A] CHI SU DE REN."
Me (writing it down) : Ah, okay.
Mark : Or, you can say about someone else, "[Don't try to cheat him. He's not a] chi su de ren."
Me (with a look of realization) : Wait. Wait. "Chi su de ren"? Vegetarian?
Mark : Yes!
So, basically here 'Vegetarian' is an insult reserved for the gullible. Sorry, Michael and Amy. When you come, I'll do my best to explain that you don't eat meat, but you're not 'vegetarians,' per se.
And then, yesterday:
Me (seeing a paper shredder) : I want one of these so bad.
Mark : Oh... what is it?
Me : It says in Chinese what it is.
Mark : But what does it do?
Me : It cuts up paper!
Mark : I know, but... why?
Me : So other people can't read it!
Mark (laughing) : But you can just burn it!
Silly Americans with their paper shredders.