The Disappearing Spoon: And Other True Tales of Madness, Love, and the History of the World from the Periodic Table of the Elements
http://www.amazon.com/Disappearing-S.../dp/0316051640
This wouldn't classify as a real book, but its the funniest shit I've ever read. My wife can sometimes hear me taking a shit, laughing like an insane person.
How to Beat up Anybody
http://www.amazon.com/How-Beat-Anybo.../dp/006196977X