March 6, 2012. Fear

Well I'm probably not striking a universal experience this time, but I played a horror/shooter videogame a couple years ago called F.E.A.R. and the scenery is a lot like this, with doors, corridors, stairs and offices where you don't know when the little girl with pale skin and blood-red rags will jump at you making you almost fall off your chair. Great game though.
Actually, everyone's experienced walking alone in the dark. Once you've grown up it's not as scary anymore (or at least you deny it is) but darkness is a lot like photography, which is entirely dependent on light. In a picture, what you don't show is what people don't see, thus forcing their brains to imagine, making a small patch of grass look like a large field or a little wall like a mural. Darkness works on the same principle, not being able to see what's hidden in that corner sets your mind on fire with ideas of ghosts, demons, insane chainsaw-wielding murderers and the like. Ever confused a piece of furniture around the corner with a person? I know I have, and it scares the crap out of you!