Who would have thought that the director of torture porn gore fest Saw could come up with something so subdued and old-fashioned? (Scary we're not surprised by.) James Wan has immaculately drawn from classic scare flicks The Changeling, The Exorcist, Poltergeist, The Amityville Horror and The Birds for a potent tale of evil spirits and demonic possessions built on mood and dread for what is, arguably, the most terrifying horror film of the last decade (and perhaps one ups some of these originals). Even the title gives us the creeps.