One that's actually scary, not so ridiculously made that it's entirely too humorous to be scary.
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Alien Alien vs Dallas was -blam!-in' tense, yo.
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Easily Paranormal Activity 1. The Thing is also fantastic. I should watch Fourth Kind, I've heard a lot of good stuff. Trailer seemed meh, though.
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I don't watch horror movies, so forgive me for not being knowledgeable about the subject and not really having much of an opinion in the matter, but I enjoyed a movie, possibly titled "Jason vs. Freddie" (Or some such). I didn't like it because it was scary (It wasn't), but because it was hilarious.
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The Eye was the only one that I ever cared about, because it actually had somewhat of a story. Unfortunately, that meant that it wasn't really scary. In the slightest. Still good, though
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I watched Dead Silence recently. That got me.
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either The Fourth Kind or Paranormal Activity. both scared the shit outta me the first time i watched them, and The Fourth Kind still does.