Stephen King once wrote that making horror is a lot like martial arts: finding vulnerable points and pressing, which is a perfect description of what this ultra-low-budget but extraordinarily clever film about a demonic haunting does. Those who have ever felt the hairs on the back of their neck raise up for no particular reason, or have heard a strange noise in the middle of the night that may or may not have been the ice maker, or have felt somehow exposed if their foot is sticking out from under the sheet at night will find it absolutely bone-chilling and very hard to forget, especially late at night. (Starplex 16, Waco, TX)