The Dark Knight
Prior to filming, Ledger isolated himself from the outside world, locking himself in a single room for weeks. During this time, Ledger maintained a creepy diary in order to stay in "the realm of a psychopath." The role was challenging and Ledger was forced to break down boundaries between himself and the villain. Even after production had closed, Ledger couldn't separate from the character.
"I probably slept two hours a night," he said in an interview with The New York Times. He later overdosed on sleeping pills...
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