A guy walks into a bar with a monkey.

The monkey grabs some olives off the bar and eats them. Then he grabs some sliced limes and eats them.
He then jumps onto the pool table and grabs one of the balls. To everyone's amazement, he sticks it in his mouth, and somehow swallows it whole. The bartender looks at the guy and says, "Did you see what your monkey just did?"
"No, what?"
"He just ate the cue ball off my pool table... whole!"
"Yeah, that doesn't surprise me," replied the guy, "he eats everything in sight. Don't worry, I'll pay for the cue ball."
The guy finishes his drink, pays his bill, pays for the stuff the monkey ate and leaves.
Two weeks later the guy is back, and has his monkey with him. He orders a drink and the monkey starts running around the bar. The monkey finds a maraschino cherry on the bar. He grabs it, sticks it up his butt, pulls it out, and eats it.
Then the monkey finds a peanut, and again sticks it up his butt, pulls it out, and eats it.
The bartender asks, "Did you see what your monkey did just now?"
"No, what?" replied the man.
"Well, he stuck both a maraschino cherry and a peanut up his butt, pulled them out, and ate them!" said the bartender.
"Yeah, that doesn't surprise me," replied the guy. "He still eats everything in sight, but ever since he had to shit that cue ball out, he measures everything first now."