I'm more than happy being in aircraft, with and without engines at any height or attitude. However, the following scare me fartless: Looking over cliffs; down stairwells in blacks of flats; over balconies etc. Abseiling; Climbing up ladders over ten feet or so; being near the edges of the roofs of buildings and lastly, the most surprising one to me, being in (or is it on?) a "primary" glider - ie. a simple frame with a wing and a seat.
However, I've also had to bail out of a glider and that didn't affect me untill the following day.
PM