American Psycho hinges on ambiguity: the conundrum after the conclusion of the film pervades one's mind and refuses to leave. Nobody ever seems to agree on the events that took place.

Using the Bret Easton Ellis novel of the same name as a guide, director Mary Harron's "American Psycho" from 2000 swiftly became a horror favorite. Though lead Christian Bale used to get weirded out ...