The real meaning of American Psycho can be relatively hard to decipher, as the film's deeply psychotic protagonist and ambiguous ending make its general message somewhat difficult to unravel.

Based on Bret Easten Ellis' 1991 novel of the same name, American Psycho follow a New York investment banker named Patrick Bateman who leads a double life as a violent serial killer.

Christian Bale's performance as Patrick Bateman is iconic and helped put both the actor and the film on the map.

American Psycho sees Christian Bale's Patrick Bateman indulge his most violent urges, living out his own depraved and sadistic fantasies while enjoying his affluent lifestyle.

The film proved to be every bit as controversial as Ellis' novel - which the author considerable to be unfilmable - detailing Bateman's descent from depravity into true madness.

The film ends on a decidedly ambiguous note that calls much of American Psycho's story into question, prompting many to believe that it made use of the (somewhat cop-out) "it was all a dream" trope.

As the film establishes Patrick Bateman as an unreliable narrator, it's easy to assume that the murders didn't happen.

Instead, the ending should call into question why no one else is addressing Bateman's troubling comments, and that's where its real ambiguity comes in.