Man and UFO What's the difference between an intelligent man and a UFO? I don't know, I've never seen either one. Thinnest book What is the thinnest book in the world? What men know about women. Expensive stereo Only a man would buy a $500 car and put a $4000 stereo in it. Thickest book What is the thickest book in the world? "What Men Think They Know About Women"