It's one thing when a private citizen decides to go off the rails, it's something completely different when a famous person does it. Dig this massive feature on celebrities who lost their marbles. Margot Kidder Superman's first girlfriend had a lousy time after the Man of Steel flew town. Margot Kidder is best known for playing Lois Lane in the original Superman movies opposite Christopher Reeve. Unfortunately, Kidder quickly fell victim to the paucity of roles for women above a certain age and saw her career flounder. Things got worse when her bipolar disorder flared up in 1996, causing her to have a very public meltdown that caused her to get picked up naked and cowering in some Glendale shrubbery. Kidder has managed to keep her condition under control since then, thankfully. Tom Cruise If you were to name an actor who is always in control, Tom Cruise might be near the top of the list. The miniscule Scientologist carefully manages every aspect of his public persona. That...