The Last Exorcism comes out later this month, but the movie already has tons of online buzz, thanks to a genius marketing campaign involving a hot girl, unsuspecting teenage boys on Chatroulette, and the scariest bait-and-switch trick ever. Video inside.

Just a warning: this video may be a bit NSFW, but only for the occasional "Fuck!" and—if you're easily startled—one stunningly scary girl. Anyway, here it is:

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[YouTube via The Daily What]