When an old man walks in, taps him on the shoulder and says "I just fucked your mother! Whatcha gonna do about it, big man?". The music stops, the patrons turn to look, but the fighter says nothing and keeps drinking. The old man gets frustrated and leaves in a huff.
Later, the old man comes back and jabs the fighter in the shoulder again. "I just got back from fucking your mom again! Whatcha gonna do about it, big boy?" The fighter just shruggs it off and keeps to his drink so the old drunkard leaves again frustrated.
Another 2 hours go by, and the old man shows back up. He stumbles over to the fighter and yells "I'm just gonna keep fucking your mother! Whatcha gonna do about that?!"
The fighter finally puts his drink down, lightly grabs the man by his shoulders, and says, "Dad, you're drunk, go home."