From the sexcapades of Bill Clinton to the unbelievable story of Hugh Grant and the prostitute; from the 15-year-old who weighs only 82 pounds but believes she's obese, to the professor who screams profanities at other drivers in snarled traffic--we wonder out loud, "What are they thinking?!" What drives so many apparently normal, intelligent people to act irrationally, harming themselves and others? According to Sigmund Freud, such behavior may be...