I hate myself when I do this, I actually am one that loves to be surprised. Most of the time when trailers come on TV I don't watch them because I don't want to know too much in advance of seeing the movie for the first time.
However, because we waited SO LONG for the first AvP I looked at too many spoilers (even the Grid-killing-Chopper scene) and now I'm doing it again! Arrgghh! Now I wish I could forget everything and go into the theater with a fresh set of eyes.
Anyone else feel that way?