A guy walks in to Cocktail Bar with a monkey on his shoulder, places the monkey on the bar, orders 2 drinks, a Manhattan for himself and a double Martini for he monkey.
They drink their drinks, the guy orders 2 more and so it goes on for about an hour until the monkey drunkenly staggers over to the Pool Table, picks up the 8 ball and inserts it up its back-side.
Seeing this enrages the Barman and he tosses them both out.
A week later they return, the guy with the monkey explains to the Barman that he has rectified things regarding his monkey's behaviour so the Barman allows them to stay.
The guy with monkey orders the same drinks as the time before, suddenly the monkey picks the olive out the Martini, shoves it up his behind, removes it then sets about eating the olive.
The monkey's owner notices that the Barman is looking quite shocked and a bit queasy as well so he tells the Barman, " It's okay, ever since the 8 Ball episode my monkey has been learning to check the size of everything he eats or swallows."