Writer's Block: Set the Scene
Tight spaces, hands down. I also get a little twinge in my spin when I'm in familiar spaces with uncertain shadows - the house where I grew up had a space down the hall on the first floor that used to make me run up the stairs every night before bed. I was certain that my grandmother's ghost was hiding (she passed in our home), and about to scare me, or just trying to touch me, but this is all children's logic, really. In terms of tight spaces, I just don't do them. I was in a cave in the Czech Republic once, and I had limited mobility within the cave because of a dark tunnel where you had to get on your hands and knees and feel the confined space around you as you made it into the cavern. Not my favorite thing AT ALL.