It made me lose my fear of Amnesia, I guess.
I was never one of those people you see on reaction videos, screaming, freaking out, closing out to look at eye bleach, but I still felt some damn good fear when I first played the demo. A few years prior, around when it first came out, I heard about it and just thought "there's no way in hell I'm playing that game, I'd never be able to handle it" and here I am anxiously waiting for AAMFP so I can actually fear a game again. When I'd encounter a monster before, I'd be all "ohshitohshitohshitfuckfuckfuckfuck", but now I find myself going "Oh, hey, what's up grunt, I guess I have to hide in the closet now, don't I? *sigh*"
I guess I can actually thank (besides FG, of course) AAMFP for getting me into this. I remember stumbling upon the teaser last summer, which inspired me to try the demo, which I failed at, but one of my friends had the game and convinced me to get it later. And now, I'm still waiting for that blasted sequel and I'm long since done with TDD and immune to it's terror.
It also kinda got me back into gaming, too. I was a big gamer in my younger years, but then other interests took over beneficially, but now I feel like I can get back into gaming without getting to carried away and horror games, which amnesia opened the door for, can do just that. I feel like a get more out of a horror game than any other type of game, somehow, I guess, fear can be addicting when you know it's harmless. I like to shit my pants in fear, what can I say?