You know, a game gets a lot scarier when you like the protagonist, and have to go up against horribly disfigured (physical/mental/spiritual doesn't matter, but mainly the latter two), environment warping (blinking lamps, screen going twenties style) something that you know the character will turn into one too and suffer for all eternity. And all you have to defend yourself at best is a crappy pistol with two clips.
Related: I once read an article about how little girls in games are supposed to be scary because "at first you calm down when you see them". Riiiiight, I emerge from the bloody boss fight inside the lighthouse on a prison island where everything has gone to hell and back only to be greeted by three identical looking dead-pale little girls in similarly pale white clothes that were out of fashion for at least 200 years, they laughingly ask me if I want to play with them, and yes, my first reaction will be to ****ing calm down instead of shooting them with my trusty tommy gun.
This scene was in The Suffering btw.