In a year filled with great horror movies, Warner Bros.' summer sequel The Conjuring 2 is being hailed as one of the most terrifying. And its success at the box office was certainly helped along by a truly horrifying trailer that clutched at the heart and left its audience breathless. But watching the trailer backwards is proving to be even scarier.

Backmasking, which became quite popular in the 60s and 70s, is a recording technique in which a sound or message is recorded backward onto a track that is meant to be played forward. Backmasking is a deliberate process, whereas a message found through phonetic reversal may be unintentional. Here, director James Wan and his team went out of their way to include some quite terrifying elements that only work when you watch this footage in reverse. And its demonic presence is more horrifying than the most foredobing Black Metal band.

That doesn't mean you'll turn into a demon-worshipping lunatic after you watch it, but it is sure to creep you out in all-new ways. Warner Bros. released this reverse trailer exclusively to Entertainment Weekly in support of the upcoming Blu-ray and DVD release. And we suggest you don't watch it alone or late at night by yourself. If you make that mistake, make sure you have your phone and a nightlight handy.

Saw co-creator and director of the original Conjuring, James Wan returns for this spooky sequel that is based on one of the most infamous real-life supernatural cases ever investigated. Patrick Wilson and Vera Farmiga return as paranormal ghostbusters Ed and Lorraine Warren, who first take on The Amityville Horror case before flying to England to confront the 'Enfield Poltergeist'. About including the Amityville Horror in the movie, James Wan had this to say.

"After we finished the first Conjuring, a lot of people were speculating, and hoping, that the next movie would be the case of the Amityville haunting. I knew that I had to touch on Amityville, but I knew that I didn't want to make another movie about the Amityville story, because that's been kind of touched to death and there's been so many stories told off that particular case. So, I knew that I was going to do it more as a cold opening for Conjuring 2, but that then laid the foundation for what the main movie was going to be about. To me, the Enfield case is a mirror story to the Amityville case. We even have a line in the movie where one of the characters says, 'This is England's Amityville,' just to really make that connection between the two. Both cases are highly publicized, both cases have their fair share of fans, and both cases  have their fair share of skeptics. To me, that's what Conjuring 2 really is - it's the other side of the pond, but dealing with similar stories."

The Conjuring 2 is coming to Blu-ray and DVD next week, on September 13. The release is packed with extras that include scary new deleted scenes and a few behind-the-scenes featurettes that delve into the real life case, with some documentary footage that is actually scarier than anything in the movie. Though, it doesn't touch the horror to be found in this reverse trailer. Check it out, followed by the original theatrical trailers released earlier this year leading into The Conjuring 2's debut in theaters.