Insidious

James Wan and Leigh Whannell's Insidious revitalized supernatural horror by flipping the haunted house formula on its head. The reveal that the house is not haunted — the child is — opened an entire mythology of astral projection and spiritual parasitism that felt genuinely fresh. Patrick Wilson and Rose Byrne ground the increasingly surreal events in real parental terror, and Lin Shaye's Elise Rainier became horror's most beloved psychic since Tangina in Poltergeist. The red-faced demon's appearance behind Patrick Wilson during a casual dialogue scene is one of the great jump scares of the century — not because it is loud, but because it is so casually, impossibly wrong. The film launched a franchise and, alongside Paranormal Activity, proved that PG-13 horror could be genuinely terrifying.