A boy is born without a body; only a head. For his 21st birthday his father takes him to a bar for a drink.
The father orders his son a scotch and when the boy drinks it, an arm pops out of his head. He drinks another shot and another arm pops out. After the next shot a torso pops out. After more shots, suddenly, he has a whole body.
The boy runs out of the bar and gets hit by a truck, killing him instantly. A drunkard in the corner looks at the father and says, "He should have quit while he was a head."
Sad, but what an absolutely implausible joke. It would be impossible to live without bodily organs, so if you do retell this joke you may want to point that out. In case you are telling it to a moron.
