A guy and his monkey walk into a bar. The guy sits down at the bar while his monkey heads off for the pool table. He jumps on the table, grabs the cue ball and swallows it. The bartender throws them both out onto the street, barring them from his establishment for two weeks.

Two weeks later, the guy and his monkey walk into the bar. The guys sits down at the bar with his monkey next to him. The monkey grabs the jar of olives, twists off the lid, stuffs an olive up his butt, then pops it in his mouth. Just before the bartender throws them both out onto the street again, he asks the guy "What's the problem with your monkey?" The guy answers "Well, ever since he swallowed that cue ball, he measures everything first!"