The movie might be my favorite horror film of all time, and seems to have drawn much of its dialogue verbatim from the book. So, the book was good, but Roman Polanski did something awesome with it to make it just so, so terrifying. What's interesting to me is that over time, I find different aspects of it scary. Right now, the thing that really strikes me is how much difficulty Rosemary has finding an obstetrician who will actually listen to her. Being pregnant and being at the mercy of people who poo-poo your concerns is definitely a very scary place to be.