What game scared you the most?

Never played anything that scared me enough to make me want to stop, but I do have one that definitely got my heart racing in a good way. A little context: I was home alone, it was getting dark and the power had been out for several hours. I was bored, looking for something to do, and since my laptop was pretty full on power I opened it up. Had only just finished installing the first Corpse Party before losing power, so I fired that one up. Fully dark outside now, so the pitch black, the silence (I live in the country), and my anxiety issues were already working together against me. And the music in that first chapter, the spooky school-hellish environment...yeah, I was pretty jumpy for a while. Actually, now that I think about it, I did have to stop playing, haha. I actually switched from that to G-Senjou. And then the power came back on.