Boo (2005) is a Horror film that follows the friends Emmett, Freddy, Marie, Kevin and his reluctant girlfriend Jessie decide to spend the Halloween night in an abandoned hospital. Meanwhile, the younger Allan meets the old friend of his father Arlo Ray Baines and asks him to help to find his vanished sister Meg in the same spot. The two groups meet each other in the mental institution section on the haunted third floor. Currently, you can watch Boo on Bloodstream, Amazon Video. Streaming availability may vary by country and platform over time. It has a user rating of 4.9 out of 10 from 137 votes. Fans of horror movies may also want to explore similar titles below.