Related Clues:

• Psycho
• Madman
• One who might be put away
• Sadistic sort
• Nut job
• Crazy one
• Raving lunatic
• Extreme fan
• Out-of-control
• Crazoid
• Wack-job
• Zealot and then some
• ''Flashdance'' hit song
• Norman Bates, for one
• Zealot-plus