Of course a new trailer for Keep Watching dropped on Friday the 13th. The latest frightful addition to Fall's gripping horror movie slate [1] stars Bella Thorne and The Walking Dead's Chandler Riggs [2]. It focuses on a family that's trapped in its own house with a deranged killer. There's a catch, though: he's rigged their house with a dozen or two dozen cameras, and he wants them to fight back. To add yet another twist, Sony has decided to release the film in theaters for just one night . . . and just one showing. Keep Watching will play everywhere at 10 p.m. on Halloween [3] night. Why? As the deranged killer says in the trailer, "because it's fun."