Looking for a way to create the character of Patrick Bateman, Christian Bale stumbled onto a Tom Cruise appearance on David Letterman. According to American Psycho director Mary Harron, Bale saw in Cruise “this very intense friendliness with nothing behind the eyes” and Bale subsequently based the character of Bateman on that.

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Joseph Gordon-Levitt and Christian Bale on the set of The Dark Knight Rises