Oh, Rosemary's Baby. Yes, it's a great movie, but while you have a very young Mia Farrow who's glowing throughout her pregnancy, in contrast you have Minnie Castevet, played Ruth Gordon. Eventually, Farrow's character gives birth to, well, the son of Satan. This situation has been brought on by the interference of Castevet and her husband, Guy, and his need to succeed in his career. Basically, a sacrifice is made to the Devil, but Farrow had no choice in it. But all of this could have been avoided is Minnie had not been an evil, Satan-worshipping villain who's literally sent from hell.