#1 Locked Up
To really get into the Joker's head, Heath locked himself in a motel room for 43 days. This allowed him to feel isolated and alone with his thoughts and perfect the crazed Joker we all saw on screen.
#2 Like Clockwork
The gestures of the Joker were heavily influenced by Alex De Large, the main character of the 1971 movie A Clockwork Orange, played by Malcom McDowell
While the actions of the Joker were influenced by one actor, the appearance of the Joker was based on musician Sid Vicious.
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