I work on elevators so heights don't bother me. It's really common though, you really don't know until you're put in that situation. We did have a guy come out on his first day of a job, we took him to the top of a 40+ story building and got on top of the elevator, he took one look down, said later to everyone and we never seen him again. We do have others that are semi scared and will wear safety harnesses every time and get pale and sweaty, but it's kind of a macho thing for most of us, not wanting to be the one to put one on.