When I was 9, the first Terminator scared the motherfuck out of me. Arnold was ruthless, especially in the police station. That scene fucked me up for whatever reason.
I haven't been spooked, you know the kind, like completely spooked since the first SAW. Dread Pirate Roberts having to cut his foot off, poor Monica Potter on the phone, then that supposedly dead motherfucker comes alive??? What?????
That was the last time I was actually short of breath in a theater because of what was happening on screen.
Sorry I don't have any original or obscure recommendations, I'm sure everyone has seen those two by now.