There Will Be Blood: https://www.youtube.com/watch?v=ml2Ae2SIXac
Builds wonderfully. Initial music containing just the right amount of paranoia and unease. I cannot recall what movie I was actually in the theatre to see, but this trailer stuck with me after it was over.
The Watchmen: https://www.youtube.com/watch?v=R3orQKBxiEg
I've heard a mixed response from folks on this film. I didn't see it, but I at least thought about it, only because the trailer was so sick to me. A lot of great imagery there.
The Social Network: https://www.youtube.com/watch?v=lB95KLmpLR4
Caught me off guard. Thought the idea of a Facebook movie sounded ridiculous, but the first part of the trailer kind of
changed my tune. Still wasn't super sold until I saw it, but even as a non-Radiohead fan, that cover was pretty irresistible.