A man walks into a bar and orders a beer. After the first sip he sets down the beer. Looking around for a second, a monkey swings down and steals the pint of beer before the man is able to stop the monkey.

The man asks the barman who owns the monkey. The barman 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."