As I believe I've mentioned on this board before, I have flown powered aircraft, gliders, hang-gliders, and parachutes. Loved it all, no fear.
But get me two steps up a ladder and I get the shakes so bad I would even spill a beer, which for me is a mortal sin. I might try that CN Tower thingy, but there would have to be someone to push me and/or pull me around it, just in case. Oh, and Kleenex, for the tears.