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I have to say I really loved Paranormal Activity. Most of the sequels are crappy, as it is usually the case with these kind of movies but the very first film was pretty creepy and cool. I don't even believe in ghosts and I was pretty freaked out afterwards ;-).
Another, less mainstream horror movie that I really love is "Funny Games", an Austrian film by the director Michael Haneke. Haneke later made an English-language version called "Funny Games US" with the same story. I love this film not only because it's scary but because it is very smart and somewhat artsy in its conception - something that is very uncommon for mainstream horror flicks. On the surface, Haneke's film is just another horror movie but when you go look closely and analyze it, you realize that it's in fact a very bitter satire of the horror movie genre. Haneke shows a lot of completely unnecessary violence and does that in a way we enjoy watching it. By doing this, he criticizes the very fact that viewers enjoy pointless violence. The core message of his movie is: "I see you're enjoying to watch all this violence... isn't that kinda fucked up? Why do we actually enjoy watching innocent people getting tortured and viciously killed?" So his film "Funny Games" is both a horror movie and a harsh criticism and satire of horror movies at the same time. It seems superficial at first but it's actually quite sophisticated and that is what I really love about it.1