Forgive me for sounding painfully square and out-of-place in this thread, but I honestly don't know how you guys can enjoy watching these movies; I've been reading the wikipedia plot summaries for a bunch of them as they've been mentioned here, and I dunno, I'm all too aware of what human beings are capable of, but I don't exactly enjoy dwelling on it or being reminded of it.
I think it's especially the ones involving innocent people, especially happy families, that really get to me; I mean, reading the summary of that "Funny Games" movie, those scumbags beating a dog to death with golf clubs, and then torturing and killing the family; are these movies made by people who had horrible upbringings by unloving/absent/abusive parents, and this is simply their way of acting out their jealousy and hatred towards happy, well-adjusted people? I dunno, the graphic nature of these movies wouldn't be so hard for me to stomach if so much of it wasn't well within the realms of possibility, this is not a side of humanity I want to energize and be reminded of.
And to those who might say "it's important we be reminded humanity is capable of this", or the filmmakers who claim that or something similar as the "message" of the film, I'm sorry, but I can't buy that when it comes to the majority of movies that've been mentioned here; what possible purpose is served? I highly doubt it's gonna enact some great social change, or raise public awareness about home invasions or psychopaths; graphic violence in war movies at least serves a purpose; here it seems just intentionly designed to be as sick and twisted as possible, and I just can't understand how some people could find that appealing.