1) The Texas Chainsaw Massacre (2003)
Yes, I chose the remake. This is honestly probably the dumbest thing I've ever jumped at...the scene where Sheriff Hoyt comes up to the teenager's car window out of nowhere. It's such a cheap move but for some reason or another I did not see this coming at all.
This film was effectively creepy without relying on jump scares but when Giant Pennywise came out of the projector the Losers were watching, that had me out of my seat.
3) The Descent
I'm sure you can guess what got me in this film before I even say it. Yes, that car crash/fake out ending. Honestly this is just a brilliantly done film all around, and there's nothing quite like thinking your final girl made it, only to get scared out of your seat, then slapped in the face with reality.
Bonus: Gothika. Not because I flew out of my seat, but because a woman in another row did and dumped her entire popcorn bucket all over me. I actually love this movie, it's a weird guilty pleasure, but I always think of popcorn lady when I watch it.