From the nation's top collector of curious and interesting information comes a book of strange gadgets you never knew existed. The writers behind Uncle John's Bathroom Reader present this totally true treasury of amazing gizmos--devilish devices you never knew existed, created by people who thought the world absolutely needed what they had to offer and sell.   Read all about:  * The onesie that turns your crawling baby into a mop * The fart-stifling blanket * The square watermelon * The video game you control with your mind * The weight loss device that sucks food out of your stomach