Many horror movies carry rumors of curses that hang over the cast and crew. These are often legends passed down through audience members. On Rosemary’s Baby, though, the film’s producer and actor William Castle grew convinced that the movie was cursed. The odd occurrences that happened after filming were enough to convince him that the movie’s events were coming true.
Source: A ‘Rosemary’s Baby’ Producer Was Convinced the Movie Was Cursed