A guy walks into a bar. He sits down and says to the bartender, "I'll bet you $100 that if you put a shot glass at that end of the bar, I could stand at the other end and fill it up with my urine."
Well the bartender thinks, "That's an easy $100." So he says "Okay."
Thus the guy gets on top of the bar and pees everywhere, even on the bartender. Well, the bartender doesn't care, he just won $100. So very happily the bartender asks for his money.
The guy very happily says, "Here you go!"
The bartender then asks, "Why are you so happy?"
And the guy says, "Well, do you see that guy at the other end of the bar?"
The bartender looks and finds a gloomy looking man.
Well, I bet him $1000 that I could pee on you and you would be happy!"