I hate heights (Yes, I know, many think that's weird, because I am a pilot). Outside of an aircraft, I'm terrified of heights.
Unfortunately, we also have an...interesting roof. Think wide, long, somewhat steep, ski slope on one side and very steep and shorter on the other side.
The transition from the ladder to roof and back freaks me out, walking on it freaks me out, looking over the edge really freaks me out. Seeing the tops of the really tall pine trees level when at the peak freaks me out the worst. I am only remotely comfortable when laying spread eagle on it.