Phantasm

Mike is a teenager who has recently lost both his parents. In addition to having terrible nightmares, Mike has also developed a fear of losing his brother Jody. When Jody goes to a funeral for one of his friends, Mike follows him and watches the proceedings from a distance through binoculars. He is shocked to see the mortician, the Tall Man, lift the coffin all by himself. When he investigates this strange occurrence, Mike finds lots of bizarre things happening at the mortuary, and tries with help of Jody and another man to stop the Tall Man. (official distributor synopsis)