What part of Amnesia scared you the most?

[Spaceman]

In order of scariness:

Prison - This place was just mental. Jet black darkness, monsters popping up left right and center, screaming people, it was just too much.

Storage - This was almost the same, except it was earlier in the game, so I was more scared etc. I shat my pants when the guy appeared when I was sprinting back.

Choir - The most oppressive atmosphere in the entire game imo!