Heath Ledger in costume as The Joker in the upcoming Warner Bros. and Legendary Pictures action drama "The Dark Knight." Ledger told The New York Times in a November 2007 interview that he had trouble sleeping while portraying the Joker, whom he called a "psychopathic, mass-murdering, schizophrenic clown with zero empathy." Ledger most recently was in production for "The Imaginarium of Doctor Parnassus."
(Photo: AP Photo/Warner Bros. Pictures)
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