American Psycho' is funny in a disturbing way

The most disturbing thing about watching American Psycho is the laughter. During one scene, Patrick Bateman, the film's protagonist, dances around with an axe behind a business partner who asks why there are newspapers spread underneath his chair. He jokes about a dog, a "little chow" in the apartment, as the axe is raised slowly over his head. The girls sitting next to me are in hysterics.