The $100 Bet
A man walks up to the bartender and says, "I bet you $100 dollars that I can stand on your bar and leak into a jar without spilling a drop."
The bartender laughs and tells him that is it such an impossible bet, he'll take it. So the man stands up on the bar, and cheering to his friends in the back, begins to leak.
He not only misses the jar, but doesn't even get a single drop in. He pisses all over the bar and floor and over the bartender. When he is done the bartender is still laughing and asks the man to give him the hundred bucks. The man hands over the money and smiles at the bartender.
The bartender asks him what is so funny when he just obviously lost so badly. The man replies, " I just bet my friends $1000 that I could leak all over you and your bar and not only would you not mind, but you would find it hilariously funny!".