American Psycho (2000)

Bret Easton Ellis' disturbing novel is brought to the screen by Mary Harron. In 1987, twentysomething Wall Street broker Patrick Bateman (Christian Bale) seems to have it all: he is handsome, successful and engaged to the beautiful Evelyn (Reese Witherspoon). However, Patrick is also engaged in an affair with Courtney Rawlinson (Samantha Mathis) - his colleague's fiancée - and at night indulges in a confused orgy of drugs, pornography, prostitution and murder fantasies. When Patrick is outshone by a rival at a board meeting, he takes out his frustration by knifing a man sleeping rough in the street. This sparks off a descent into violence and madness, with Patrick embarking on a bloody and random killing spree.