In 'American Psycho' (2000), Christian Bale delivers a chilling performance as Patrick Bateman, a wealthy investment banker who leads a double life as a serial killer. The film, based on the novel by Bret Easton Ellis, explores themes of materialism, narcissism, and the dark side of the American Dream. Bale's portrayal of Bateman is both charismatic and disturbing, capturing the character's psychopathic tendencies with precision. 'American Psycho' is a thought-provoking and unsettling film that showcases Bale's versatility as an actor.