from wiki:
Insidious is a 2011 American independent supernatural horror film written by Leigh Whannell, directed by James Wan, and starring Patrick Wilson, Rose Byrne, Lin Shaye, and Barbara Hershey. The story centers on a couple whose son inexplicably enters a comatose state and becomes a vessel for ghosts in an astral dimension. The film was released in theaters on April 1, 2011.[1] In terms of cost-to-gross ratio, it was the most profitable film of 2011.
scared me much. although, i think it extreme, body in comatose state & astral entities wanting to possess the body, some scenes are very eerily reminiscent of my own experiences