A joke

A guy walks into a bar with his pet monkey and orders a drink. While he's drinks it, the monkey starts running wild. The monkey jumps up on the pool table and grabs the cue ball, sticks it in his mouth and swallows it whole.
The bartender is livid and says to the guy, "Did you see what your monkey just did?"
"No. What did that stupid monkey do this time?" says the patron.
"Well, he just swallowed the cue ball off the pool table, whole," says the bartender.
"Yeah, well I hope it kills him because he's been driving me nuts," says the patron.
The guy finishes his drink and leaves.
Two weeks later he comes back with the monkey. He orders a drink and the monkey starts running wild around the bar again. As the man drinks his drink, the monkey finds some peanuts on the bar. He grabs one, sticks it up his butt, then pulls it out and eats it. The bartender is disgusted.
"Did you see what your monkey did now?" he asks.
"What now?" responds the patron. 
"He stuck a peanut up his butt, then pulled it out and ate it!" says the bartender.
"Well, what do you expect?" replied the patron. "Ever since he ate that darn cue ball he measures everything first."