If there's one certainty in the horror genre, it's that trends will come and go. Some strain of horror will be popular for a few years, then disappear just as quickly, waiting for its moment of reinvention or cultural relevance. The genre's recent past has been dominated by two forces: the torture-porn subgenre, in which our anxieties about war atrocities translate, somewhat clumsily, to movies where people spend whole running times getting pieces of their bodies lobbed off. The other, equally powerful force in horror movies has been the "found footage" genre, again translating our cultural queasiness when it comes to technology and turning it into something positively supernatural. But thanks to last summer's surprise blockbuster "The Conjuring," it looks like those are being shoved aside in favor of good old-fashioned haunted house spookiness. "Oculus" is a perfect example of this newly relevant style, and the results are damn scary.