Gorilla goes into a bar with his owner. Bartender says, "The gorilla can stay, but he has to stay away from the pool table." Guy agrees. Gorilla goes to the pool table, picks up cue ball and swallows it. They get thrown out of the bar.

They return two days later, and guy is carrying a small, gift-wrapped box. Gives it to the bartender. Yep, it's the cue ball, cleaned, bleached and polished. Bartender says gorilla can stay but has to keep away from the pool table. Gorilla sees peanuts on the bar. He takes them one at a time, inserts each one in his anus, scrutinizes it and then eats it. Goes on to do the same with jelly beans, pretzels, pizza crust and taco chips. Bartender asks what the gorilla's doing? Guy says, "Well, ever since he shit that cue ball he's been checking the size of all his food!"