system
Given the following post, respond as if you're commenting on Reddit:
human
What Happens In American Psycho?

I've watched American Psycho twice and I still don't understand what happened at the end.
gpt
The ending is left ambiguous. The viewers never know if all the violent acts committed were real or whether or not they were delusions of the main character. 

One of the running themes that's a lot clearer in the book than the movie is that the characters are always mistaking people for someone else. This is kind of important because at the end, one of the people that Bateman supposedly killed (the guy he killed with the axe) is reportedly alive because another character says that he had lunch with him only a few days ago. It's unclear if the victim was really alive and attended that meal, or if it was just another of the many, *many* cases of mistaken identity.