Guy says to a bartender, "I'll bet you $50 I can bite my eye." Bartender says "OK, sure," so the guy pops out his glass eye and gently bites it.
Bartender grumbles and gets out $50. "Wait a moment," says the guy. "Double or nothing I can bite my other eye." Bartender thinks there's no way this guy has TWO glass eyes, so he says "Sure, you're on." Guy pops out his false teeth and gently squeezes them around his other (good) eye.
Bartender grumbles even more and lays down the $100. "One more thing," says the guy. "Double or nothing again, that you can slide a beer glass the length of the bar top, and I can run alongside and piss into it without spilling a drop." Bartender wants the $200 so he says "Sure, you're on."
Bartender slides a beer glass along the bar top, and the guy runs alongside and pisses ALL OVER the bar. The stream hits the beer glass maybe once. It's not even close. Guy zips up, then calmly lays $200 down on the bar. The bartender is laughing maniacally and grinning like a fool.
Just then another guy at the back of the bar shoves back his chair, knocking it over, slams down his glass on the table, breaking it, and stomps out of the bar, swearing loudly. Bartender says, "What was that guy's problem?"
Guy says, "I bet him $500 that I could piss all over your bar, and you'd be happy about it."