While browsing game design sites I randomly came across this Chinese whispers game. It seems pretty funny when people play along. Warning: immaturity in some of them!

Here are a couple of the ones I was linked to. Setting up a private game seems like more trouble than it's worth but you may as well post any really amusing ones you find.

EDIT: Woops, second link is borked. But here's one Silferras did.
EDIT: Here's one of mine. Mine is the abysmal brown/red dragon & gallows deal, left column. Pretty good until some clown ruins it near the end, demonstratively!