Rosemary's Baby is still highly regarded as one of the scariest horror films ever made and the Rosemary's Baby behind-the-scenes events are surprisingly almost as terrifying. Directed by Roman Polanski, Mia Farrow stars as a woman who ends up pregnant. However, she starts to believe there is something wrong with her baby and that she might be carrying the Antichrist. She also has neighbors who seem helpful, but they all have sinister undertones that become terrifying as the movie wears on.

https://screenrant.com/rosemarys-baby-behind-the-scenes-facts-1968/