American Psycho (2000) is an enlightening film encompassing and requiring philosophy, esotericism, and quantum mechanics physics for complete understanding.

Rating: 9/10 (26 November 2001)

WARNING - POSSIBLE SPOILERS HEREIN.
During the first 75% of this movie I found myself bored, irritated and judgmental toward the main character. It was not until the last quarter of the movie when the interesting twists started occurring that it actually arrested my attention.
The main character's, Patrick Bateman, behaviours would be classified by medical science as psychopathic and/or sociopathic in nature, or as being mentally insane. Whereas, most psychopaths have or appear to have no conscience, Mr. Bateman did possess some conscientiousness, at least toward the latter part of the movie.
Bateman experienced at least one consciousness dimensional shift as a result of the "black hole" effect he was experiencing in his consciousness/mind. That shift indicated by the facts that his attorney did not recognize him as Bateman but as Davis, the attorney's knowledge that Paul Allen was alive in his (the attorney's) reality, the apartment where Allen had resided and which was then under remodeling, the real estate representative's apparent knowledge of more than one existence/dimension evidenced by her statements to Bateman wherein she requested him to cause no trouble, to leave, and to not return.
Mr. Bateman wanted, needed, and attempted to get help for his dilemma evidenced by his statement to his secretary on the telephone, "I need help Jean, I don't think I'm going to make it" to which she essentially ignored until later and his statement to his girlfriend, "I need to engage in homicidal behaviour on a massive scale. It cannot be corrected but I have no other way to fulfill my needs", to which she also ignored as well as ignoring the drawing he was making at the dining table in the restaurant. The poor fellow was surrounded by egomaniacs who were totally engrossed in themselves only.
Patrick Bateman's statements at the very ending of the movie illustrate his confusion, frustration, and lack of knowledge concerning the reality(ies) he found himself in.
This is a movie which deals with immortality, infinity, free will, and a host of other esoteric-related philosophies, as well as some quantum mechanics physics' theories.
Under the circumstances, it was impossible for me to not feel human compassion for this gentleman who found himself in a loop in hell with no obvious way out, to his present knowledge.