A man walks into a bar and orders a beer.
He takes his first sip and sets it down.
While he is looking around, a monkey swings down and steals the pint of beer before he can stop it.
The man asks the bartender, "Who owns the monkey?"
The bartender replies, "The piano player."
The man walks over to the piano player and says, "Do you know your monkey stole my beer?"
The pianist replies, "No, but if you hum it, I'll play it."