I worked for a guy once that did lines of cocaine on the toilet tank top in the mens room .... and he was a major a-hole.
So I thought I'd give him a little lift by dicing up some Altoid breath mints and sprinkling the fine powder on the toilet tank top .... make him think he left some coke from last time he snorted
So ... about an hour later in he goes ... locks the door. About 5 minutes later he busts out of the mens room with his eyes almost bleeding with tears ... face red as a brick.
I blew an entire mouthful of coffee through my nose when he ran by my desk heading for his car ....
Now THAT is funny!