Tangentially related to the previous Ira Levin post, an unearthed article from the New York Times archive, from the Watching Movies With series. This one features Julianne Moore on Rosemary's Baby, as directed by Roman Polanski, and on how he balances horror from the mundane and comedy:
"Polanski keeps yanking us back and forth between cheerful and frightened. You keep getting these little dabs of comedy, all the way through. Ruth Gordon and the other neighbors are basically played for comic effect. That's how the horror is introduced in this movie, as comedy. It's never the dominant tone, but it's there. It's like in 'Macbeth,' you know? Somehow it makes the horror even more horrible."
Also from the same 2001 series, Woody Allen on Shane.