For me it's fatal frame 2 and silent hills p.t. An indie game called the groundskeeper gave me the chills too.
Edit1: Why is everyone saying outlast? It's not even that scary!
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Edited by RYUKTHEPLUG: 3/2/2015 9:02:41 PM[b]F.E.A.R.[/b] Never even finished the first & the second made me shat myself a nightlight.