Ok, this isn't a "scariest moment" reply, but more of an "i'm an idiot" kind of story.
Playing through for the second time...at the second recycling area. I clear out an area and a hallway and I make my way to the next door. As I always try to do, I get up on the side of the door so any imps or other baddies waiting to pounce on the other side don't bowl me over. I get close enough for the door to open, I take a peak at one corner, don't see anything, then proceed to walk in front of the door to get a better look into the next room.
Maybe it was because I was low on health and I just finished off a decent size horde of demons that I was a little on edge. Anyway, I'm looking into the next room and see nothing as I stand there contemplating possiblities. The door closes and I literally jump in my seat. My brain registered that closing door as one of the fastest moving demons I've ever seen. I felt like the biggest idiot.
Please, someone, tell me that I wasn't the only one to experience this?