A guy walks into a bar with a pet monkey.The monkey immediately snatched a handfull of peanuts from the bar and ate them, similarly he snatched a handfull of olives from the bar and ate them.It then grabbed the cue ball from the pool table stuck it in his mouth and swallowed it.
The barman complained about the monkeys behaviour to the owner."There's not much I can do about him he'll eat anything in sight" said the owner .
Two weeks later the man and the monkey were back in the same bar.The monkey immediately grabbed a cherry from the bar, and stuck it up his bum,pulled it out and ate it.
"Did you see that " said the barman , " that's disgusting."
"Sure is " , said the monkeys owner."you see, he still eats everything in sight,but ever since he ate that cue ball,he measures everything first."