I'm looking for scary stuff that I can enjoy over the summer (dunno why demand for scary stuff peaks at around Summer in Korea, but yeah)
Two games I've started (somewhat) recently; Ao Oni (which is free), and Cry of Fear (Half-life mod, very long with multiple ending). If you want a popular game with good atmosphere I advise one of the first two Silent Hill games (if you can get your hands on them). Also check out
PewDiePie's vids. He's got a good list of horror games he lets plays (so you can get a taste and see if you want to dive into that particular game).
Not meaning to derail, Amnesia and other horror games go well together (also, Penumbra did "Amnesia," but I've heard their other games were lacking in comparison).
Alternatively, you can actually kill them by beating them over the head with a crate or barrel. At least, according to the wiki.
Yeah I highly doubt that (it might shove them out of the map though).