Hollywood absolutely loves to imitate whatever's popular and making money and the genre of horror is no stranger to this rule. Because horror movies tend to be made on the cheap, it's way easier to crank out films in this genre that imitate whatever spooky motion picture is raking up big bucks. Thus, slasher movies like Texas Chainsaw Massacre and Friday The 13th begat numerous slasher movie knock-offs in the 80's while Paranormal Activity spawned countless found-footage movies that heavily featured possessed people. Lately, it feels like The Conjuring, and its emphasis on old-timey objects being creepy and chilling sound effects, has been the one many recent horror fare have been imitating.
