EXCLUSIVE: Terrifyingly creepy trailer for James Wan's Insidious

If you were creeped out by Paranormal Activity and freaked out by Saw, wait'll you see what the guys behind those two franchises cooked up when they got together. We've have the exclusive first look at their new movie, Insidious, right here.

Insidious, which stars Patrick Wilson, Rose Byrne and Barbara Hershey, is a new horror film from Saw's director-writer team of James Wan and Leigh Whannell that's produced by Oren Peli, Jason Blum and Steven Schneider, the masterminds behind Paranormal Activity.

The movie tells a different kind of haunted-house story, one in which a family trying to escape a haunting and save their son discover—it's their son, and not their house, that's being haunted.

Insidious hits theaters April 1, 2011. And after you watch the trailer below, check out the film's Facebook page for more info.