A nasty prank to play on some douchebag who has done something to annoy you.
Simply take a washcloth or dishtowel, and urinate on it profusely. If you don't have enough piss to soak the whole thing yourself, find a
like-minded prankster to piss on it too...the more the merrier.
Then, take the
piss-soaked cloth and either A) throw it at the intended recipient or B) leave it someplace where he is likely to find it (on his doorknob, in his mailbox,
whatever).