Phantasm (1979)

At a funeral, Mike (Michael Baldwin), watches as a tall mortician clad in black (Angus Scrimm) tosses the unburied coffin into a waiting hearse as if it were nothing. Seeking the truth behind this unusual sight, Mike breaks into the mortuary, where he comes face-to-face with the sinister Tall Man. After barely managing to escape with his life, Mike enlists the help of his brother, Jody (Bill Thornbury), and their friend Reggie (Reggie Bannister). Together they set out to uncover the secrets of the Tall Man and those who dwell in his hellish world.