American Psycho is definitely worth watching. It has very dark humor in it. A great critique on narcissism of yuppies from the 1980's. It is a great insiders look to the mind of a crazy person. The main Actor is Christian Bale, who plays Patrick Bateman a wall street guy .
"We talked about how Martian-like Patrick Bateman was, how he was looking at the world like somebody from another planet, watching what people did and trying to work out the right way to behave. And then one day he called me and he had been watching Tom Cruise on David Letterman, and he just had this very intense friendliness with nothing behind the eyes, and he was really taken with this energy." - The films Director Marry Haron about where Christian Bale got his inspiration for the role. According to the Huffington Post.
Basically you get to see Christian Bale doing a Tom Cruise impersonation while Tom Cruise is playing wall street guy in the 1980's. It is great. It is an amazing ride to see Patrick Bateman completely lose his mind. The film is a dark comedy. If you love Wonder Showzen you will love this. This movie is disturbingly great.
FUN FACT: Dexter is based off of this film. According to Wikipedia: "In the sixth episode of the first season the title character is even revealed to use the alias of "Dr. Patrick Bateman" to buy narcotics."
So you want some brutal fun time gather the gang together and watch the film that inspired the creation of Dexter.