A man walks into a bar after a long ride on his horse. He walks up to the bar and asks the bartender for a beer. When he gets his beer, he starts eying this beautiful lady in the corner.
Just as he turns back, a monkey runs up to the beer, dunks his balls in the beer, and runs off.
Agitated, the man says to the bartender "I can't drink this now! Give me another beer!" So, the bartender brings him another beer. Before the man could do anything about it, the monkey ran back over, dunked his balls in the beer and ran off before the man could grab him.
Even angrier, the man says "I can't drink this now. Bring me another beer!" He gets another beer and guards it with his life. The monkey sneaks up behind him, knocks the stool out from underneath the man, hops up onto the bar and dunks his balls in the beer.
Now the man is thoroughly pissed. He grabs the bartender and says "Man, I've had it. Whose stupid monkey is this anyway?" The bartender replied "It belongs to the piano player".
The man walks over to the piano player and says "Excuse me, do you know your monkey is dunking his balls in my beer?"
To this the piano player replies "No, I sure don't, but if you hum a few notes, I'll do my best".