Three guys are having a drink at the bar when a drunk comes stumbling in off the street. The drunk points at the tallest guy in the middle and exclaims in a loud voice, "Hey you! I screwed your mother rotten last night!"

The guy in the middle shrugs and continues his conversation with his friends. Frustrated by the lack of response, the drunk stumbles back into the street.

A few minutes later the drunk stumbles into the same bar, points a grimy finger at the same guy and yells, "Did you hear me, *******?! I said I fucked your mother last night and she was great!".

Finally, the tall guy in middle responds, "I know dad! I heard you the first time now go home!"

Good one!