I have a healthy respect for heights.
I don't like yellow insects with stingers.
As a child I was stung by wasps. I was minding my own business, but they weren't minding their own business.
I have balance issues, so being close to a high ledge could prove to be most unfortunate if I lost my balance. The only part that might hurt is the landing.
I've been poked and prodded so many times that needles don't bother me at all. I actually watch and hold conversations with the people as they insert the needles.