Things that would have made Amnesia scarier

[RaisingInsanity]

I'm not sure if this has been said before (sorry for not reading all the posts so far), but I somehow think this could work in some way.
I wonder if any of you have experienced the feeling when you walk down the stairs, It's pitch black and you cannot see anything. Your vision has not gotten used to the darkness, and suddenly something looks like it appeared right before your eyes, or like if something flashed in front of you or just beside you. However, after you've gotten the shit scared out of you, you see nothing and proceed.
Also, when walking past a room you saw something there, but when you went backwards to see what it was it was in fact just a normal piece of furniture, a candle or something like that.