A man walks into a bar with a monkey. The bartender informs him that his establishment doesn't normally allow animals, but since there was nobody else in the bar, he would allow it this one time. "but is he going to behave?"
"of course. He's a very tame monkey" replies the patron
The man is sitting down and enjoying a nice cold beer, and the monkey starts wandering around the bar, and makes his way to the pool table. He hops up on it, and starts sniffing around, then all of a sudden, grabs the cue ball and swallows it whole.
The bartender is aghast. "Your monkey just ate my cue ball!"
The customer is amazed. "I'm really sorry. Usually he's very well behaved. Tell you what, I'll pay for the cue ball and the beer, and be on my way"
A few weeks later, the man comes back into the bar, and again, he has his monkey with him. The bartender says "Hey, I remember you and your monkey... is he going to be any trouble this time?"
"Oh heavens no", replies the man, "Ever since that day, he's been even more quiet and well behaved than usual"
Since business is slack again, the bartender agrees to let the man and the monkey stay for a drink. As the man sits quietly sipping his beer, the monkey just sits on the stool next to him, with his hands folded on the bar. Time passes, and the monkey gets fidgety. He's drumming his fingers... looking around... finally he starts checking out a bowl of peanuts the bartender has on the bar for the customers. He picks one up and starts sniffing it. Then the monkey stands up on the bar, shoves the peanut up it's ass, pulls it out again, and throws it down the hatch.
The bartender can't believe his eyes. "Your fucking monkey just shoved a peanut up his ass, and ate it!"
"oooh that." Says the man "Ever since he ate your cue ball, he's been measuring things first