He says: "Hey bud. I got a wager for you. $100 says I can piss straight into a shot-glass from ten feet away and not get a drop on the floor."
The barkeep is surprised at such a reckless bet and agrees to it, thinking it will be an easy win. The barkeep grabs a shot-glass from behind the bar and sets it on the floor about ten feet away from the bar patron.
The patron undoes his pants and proceeds to miss wildly. He gets piss all over the floor. "HAH!" Says the barkeep, smiling as he holds out his hand for the $100. The patron zips up his pants and says "Sure. Just a sec." He then walks over to another patron in the pub, collects $200, and walks back to the barkeep with the $100.
The barkeep is confused. "What was that all about just now?" He asks, tucking the $100 into his pocket. "Oh. That?" The patron asks. "Nothing much. I just bet that guy $200 that I could piss all over your pub and you'd be happy about it."
[An old one, sorry if you've heard it.]
