"Monkey With An Appetite" joke

A man enters a bar with his pet monkey and orders a drink. While he's drinking, the monkey is jumping all around the place.
The monkey grabs some olives from the bar and eats them. Then he grabs some sliced limes and eats them. He then jumps onto the pool table, grabs one of the billiard balls, sticks it in his mouth and, to everyone's amazement, swallows it whole.
"Did you see what your monkey just did?" the bartender screams at the guy.
"No, what did he do?" the guy asks.
"He just ate the cue ball off my pool table-whole!" exclaims the bartender.
"That doesn't surprise me," the guys says. "He eats everything in sight, the little bugger. I'm sorry. I'll pay for the cue ball and the other stuff." He finishes his drink, pays for it, pays for the stuff the monkey ate, and leaves.
A couple of weeks later, he goes to the bar again and has his monkey with him. He orders a drink and the monkey begins to run around the place again. While the man is finishing his drink, the monkey finds a maraschino cherry on the bar, grabs it, sticks it up his butt, pulls it out, and eats it. The bartender is disgusted.
"Did you see what your monkey did this time?" he asks.
"No, what did he do now?" the guy asks.
"He stuck a maraschino cherry up his ass, pulled it out and ate it!" the bartender explains.
"That doesn't surprise me," the guy replies. "He still eats everything in sight, but ever since he swallowed that cue ball, he measures everything first!"