support your answer with proof.
blister:
Unless you really wrote that try giving a link to the source of your answer such as:
This is a rather famous thermodynamics question. A search on google will turn up many many copies of the student essay which made it famous and which has been widely circulated by email, e.g.
http://www.pinetree.net/humor/thermodynamics.html
Snopes has an article about this at http://www.snopes.com/college/exam/hell.htm.