First off, we'll go along with the realm of imagination and tabletop roleplaying. Let me just say, I DO NOT like Attic Whisperers. Children in themselves are kinda scary to me, but when you have a dead one that just wants a friend to play with but will kill you if you do is just all the more horrifying. Not because of the idea in itself, but because it makes you realize what kind of person you really are. In my case, the party said "NOPE!", turned around and locked the door. However, then you realize that you either by some miracle could have aided the child, died trying to be a good person, or in fleeing save yourself but turn your back on neglect. Proof in itself the scariest monster is indeed, humankind, and in this case, yourself.
Up next, I finally got around to playing Slender (incredible that I didn't before). This definitely feeds upon the fear of the unknown, and the simplicity of the "gotchya!" factor. Sometimes, the simplest ghost stories are the best. Take the gruesome tale of Pillow Pants and Lister Fiend for example:
NSFW
And then, I finally got around to playing through some Amnesia, right before its sequel Machine for Pigs is about to be released. My friends who have played through before warned me I miiight want to pick up some adult diapers, I'm beginning to suspect they may be right. This game is survival horror at it's psychological finest. I believe the creator studied other games to make a brain paranoia inducer about as potent as sulfuric acid. The worst part is that when the creatures chase you isn't the scariest part, it's when they hang out from a distance and stare in your general direction, like so (Skip to 11:00)
Lastly, I've been on a Silent Hill kick lately since I finally got my hands on Downpour and the second movie Revelation came out. I love Silent Hill 2, I love how the psyche plays upon itself and it allows for speculation on several different symbols, critters, and manifestations of the psyche. I had played it several years ago and never finished it, coming back and finishing the game was entirely worth it. Now, the games with a central focus on the cult of Silent Hill (1 & 3), those are truly horrifying, more horrifying than the voice acting in any given game of the series. The first was pureblooded horror, lots of fast critters with a bad control schema, but great puzzles and storyline pull it together, I've jumped more than once. Moving to 3, for a woman particularly, this game is terrifying, particularly for the creatures' symbolism, like Attic Whisperers, Numb Bodies disturb me
Seriously, it's a walking cervix with harlequin ichtyosis, get back inside where you belong! >.< The noises they make, they either mumble, or when left on the ground alive, begin screaming like a baby, scary I tell ya! But the redemption is that this game is extremely tongue-in-cheek with its unlockables, so, despite having to see these types of baddies (all associated for the most part with things that can go wrong during pregnancy), I find myself playing it again and again. While tedious, I enjoyed Homecoming for its storyline and creature design, and Downpour, while lacking on creature design did have a rather interesting story pulling it along, but I do wonder why the final boss is after you despite knowing the truth of the situation, perhaps it's another Silent Hill psyche trick.
Overall, I recommend each of these games, despite my dated reviews, very highly!