Cloverfield

http://www.youtube.com/watch?v=ufYF0f-zMgY
I liked this trailer because it's incredibly intriguing. You don't really know what's going on, it's just this group of people at a party and then everything becomes chaotic. You don't know what the "monster" is or anything about it, it's just the reactions of random citzens who are caught in the middle of it all that makes everything seem catastrophic. There are also scenes of desctruction that make you ponder what is going on and what is causing all of this. Again, a very intriguing trailer that definately attracted me to see this movies in theathers asap.