I get shivers down my spine everytime I hear those sounds. Just......horror....Yoshemo said:This always freaked me out
I'm not sure if these count but I'd also mention the sound that happens when a Gatherer spots you in Amnesia: The Dark Descent (Especially when you either see an unhuman shadow speeding at full pelt down the corridor towards you or if the monster in question suddenly comes in front of you).
I'll also bring up this little gem from Silent Hill 2:
Oh god, get that sound of my head!!!