This reminds me of that sketch The Head Detective on In Living Colour.
This kid was born with no neck and no body....
So, for his 21st birthday, his dad takes him to the local watering hole to celebrate.
"Give my son the best drink you can make", said the dad.
So, the boy consumed the drink, and a neck started to grow under his chin.
The father was amazed, and ordered a second drink for his son. The son drank it, and shoulders started to grow.
The father continued to order that drink, and the son drank each of them, until the son had a normal body.
"Hey, lets get you one more. You might get a body part no one has ever had before." So, the son downed one more.
POOF! The kid disappeared.
Crying, the father said to the bartender, "What was in that drink?"
The bartender replied, "I don't know but he should have stopped while he was ahead."