[On a formatting note: I've tried to both embed the trailers (where possible) and link to the trailers someplace where I know they won't be pulled. If there's no embed, blame YouTube. Just click the link on the movie's title and you'll get it.]
6. The Strangers (2008)
If you need me to tell you why, you've clearly never seen it. Click the link, press play, and remedy that immediately. The first time I saw this trailer in a movie theater, even having seen it online and knowing what was coming, I jumped and curled myself into a ball on my seat. You don't even want to know how I contorted myself during the run of the actual movie. I should also note that the entire marketing campaign for The Strangers was flawless, with other scary-as-fuck trailers, killer posters, the whole nine.
Awesome trailer attributes: great tagline; creep-tastic
14. Panic Room (2002)
The textbook example of how to deliver a thriller trailer. Never colors outside of the lines but manages to remain exhilarating and visually audacious. Hey, just like the movie.
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