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It depends on what you think of as horror.
Some people think horror is lots of blood and gory effects. They like movies like Saw or Hostel.
Some people think horror is about realism. Horrific things that COULD happen. They would rate movies like Irreversible, Misery, Texas Chain Saw Massacre, Henry portrait of a serial killer
Some like more of a thriller aspect, and would go for something like Silence of the Lambs.
Some like their horror with a specific genre. Religious - The Exorcist, Ghosts - Poltergeist, etc...2