Gregory Peck in The Omen
The set of 1976's The Omen was the site of many haunted happenings. It has been noted as one of the most cursed sets in history—producer Harvey Bernhard even carried a cross around with him. Bernhard said, "The devil was at work, and he didn't want that film made."
The film, which was centered around the antichrist, nearly drove everyone on set past the point of sanity. Gregory Peck's son shot himself only two months prior to production, and his plane was later struck by lightning. Bizarrely enough, the same exact thing happened to film's executive producer, Mace Neufeld.