A good bathroom book

I know, what a crazy title, but there are such things, and I've got one: Tongue Fu!
In a one-minute read you can get some very valuable advice on how to deflect a difficult personality or deal with frustration without losing your cool, etc. etc. I love this book. Great bathroom companion.

Other good 1-minute reads are map books, like a USA map book with a different state on every page--unendingly interesting and informative. Or Europe, or Africa, or South America.

I'd love to hear other people's ideas on a good bathroom book.