WTF!?: The Piss Puck

I was just reading "Roommate Confessions" on CollegeHumor and discovered a pretty clever prank that I'd never heard of before.

It's called a piss puck.

You pee in a shallow pan then freeze it. Once it's good and frozen, you carefully break it out of the pan and slide it under someone's door into the middle of the room. You do this at night when they're asleep...when they wake up, they've got a puddle of pee in the middle of their room. Clever.