I absolutely agree with Badass Digest's Devin Faraci about this trailer for The Conjuring: It's incredible. It's made up of two long-ish scenes, and it builds the suspense until a great payoff moment.
What we have here is probably a bad movie. (The title card that reads "From the director of Saw and Insidious" is a warning.) But I'm so sick of blender-cut trailers that this trailer leaves me desperately wanting to see the movie. A horror film that takes its time to develop a sense of menace? Yes, please!