Giving voice to the villain presents quite the acting challenge

Three weeks before shooting began on The Dark Knight, Heath Ledger called director Christopher Nolan to discuss an epiphany he had about his character, The Joker. The key to the demented killer, Ledger said, was his voice. Without a menacing hiss, it would be a retread of Jack Nicholson's satirical turn when he played the character in 1989....
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