Rosemary getting raped by the devil could probably count as a scary scene. Cassavetes really was fantastic, by the way. My favorite line in the film, I think, was when Rosemary wanted to change to a different obstetrician, because the one that she had, Dr. Sapirstein, had been ignoring her extreme pain for three months. Her husband, Guy, exclaims, "But that wouldn't be fair to Sapirstein!" He was such a creepy character... pimping his wife's womb to Satan so that he could get TV and movie parts.