This is classic Ira Levin.

Rating: 10/10 (13 August 2005)

It doesn't suffice to call "Rosemary's Baby" a horror film; that implies something corny. "Rosemary's Baby" is anything but corny. It is actually creepy. The plot of course has weak-looking Rosemary Woodhouse (Mia Farrow) getting pregnant and discovering that the father is Satan; Rosemary's husband Guy (John Cassavetes) is colluding with Satan-worshipping neighbors Roman (Sidney Blackmer) and Minnie Castevet (Ruth Gordon) so that he can get a part in a play. This has the very distinct Ira Levin feel in the way that "The Stepford Wives" and "The Boys from Brazil" did: everything looks normal, but as the story progresses, you begin to get the feeling that something's not right, and then you find out the horrible truth.
Here's something that I noticed about the movie (maybe it was just a coincidence): the name Roman Castevet. The first name brings to mind director Roman Polanski, and the last name brings to my mind John Cassavetes. But like I said, that's probably just a pure coincidence. I think that my favorite scene is when Rosemary is playing with the Scrabble tiles and finds out about the connection with Adrian Marcato.
And one more thing. This might be the only thing in the whole movie that gives it a slightly non-horrific, even remotely silly flavor: the woman who played Elise Dunstan was Emmaline Henry, better known as Amanda Bellows on "I Dream of Jeannie". Ruth Gordon later co-starred with an "IDOJ" cast member in 1976's zany "The Big Bus" (which co-starred Larry Hagman). Well...