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Many Faces - Actors Who've Worn Prosthetic Makeup

Heath Ledger, 'The Dark Knight'
Heath Ledger's Oscar-winning transformation into the Joker was helped along by three pieces of stamped silicone that created the character's scarred cheeks (and signature "smile"). Ledger buried himself in the role, living alone, keeping a diary, and constantly tinkering with the Joker's posture and voice.