A guy walks into the bar, carrying his son, who is only a head. It is his 21st birthday, so the bartender gives him a shot of his strongest wiskey, and out pops arms and a torso. The dad asks for the strongest vodka, so the bartender gives it to him, and out pops the rest of his body. The boy runs out into the road, gets hit by a truck and dies. The bartender looks at the dad and says, "Gee, your son should have stopped while he was a head."