User blog comment:Pippinspetfish/Scariest Scene/@comment-5179182-20120607205857

Fellowship of the ring: the dead dwarves in mines of moria (someone else said that i know but i agree)

Two Towers: When Smeagol/Gollum took Frodo and Sam to that swamp where there was dead people down there.

Return of the king: mouth of sauron i guess