What's a good way to get revenge on a co-worker without them knowing it's me...?

Question

I'd like to do something that's not illegal, yet is vindicitve.

Answer 1

Ex-lax brownies are my favorite trick. Powered ex-lax i the coffee. An liberal application of Ex-lax is always a safe and fun form of revenge.

They when they get back back from stinking up the restroom, you can say " wow! You will really full of crap ! " :)