Sure to be one of the most highly anticipated movies of the summer, Christopher Nolan's The Dark Knight Rises comes out on July 20. I find the trailer fascinating, both because of the story that it tells, as well as how similar it feels to some of Nolan's other work, particularly Inception.
I also really love the tag line for the movie: "The legend ends." If you didn't already think the trailer was about the darkest thing ever, that should do it, I think.