*Spoiler alert!..... Wow, it's amazing how many people don't seem to understand that this was all happening in the guy's head, which explains the "gaps" in the story ie. missing bodies, the kid being the killer, etc... He has DID/MPD and the characters were all created by him as a kid to cope with his trauma. This all should have become clear to you part way through the movie. Open your mind, people! Lol.. If you are someone who actually understood and enjoyed this movie, I would also recommend "Fight Club" and "I'm Thinking of Ending Things".