Defiantly anything from Slimebeast.
-Funnymouth
-Abandoned by Disney
-Room Zero (Abandoned by Disney 2)
-The Russian Sleep experiment
-Morbis.avi ( )
-MARIO (It isn't too creepy until you realize that it's a true story)
-Normal [NSWF] for normal people
These are some of the really scary ones. Also, people, Sonic.exe isn't creepy, it's just a bunch of blood and cliches.