Is it possible to weigh a human head without first detaching it from the body?

Laugh out loud and then think about it carefully, because I don't think it is possible.
Update: Laugh out loud and then think about it carefully, because I don't think it is possible. After 14 answers I think 12 of you have missed the point - so let's rephrase the question to weigh a leg rather that a head!
Update 2: sorry - "rather THAN a head"
15 answers 15