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Here's the trailer for Paranormal Activity 3, which, like its predecessors, focuses on Katie, a good-turned-evil suburban girl. And just like the franchise's second installment, it looks like we're in for another prequel, going back all the way to 1988 this time. The trailer promises to help us "discover the secret behind the activity" and is predictably full of creepy girl glares, creepy girl games (Bloody Mary!), and other things of a creepy girl nature. Paranormal Activity 3 will hit theaters this October—just in time for Halloween, naturally.