fear of heights - Another very common fear, of course, is the fear of heights, which makes a lot of sense. After all, we weren't exactly designed to fly. But often, a fear of heights can become an irrational obsession, so bad that many sufferers are too frightened to even use an escalator in a shopping centre. So imagine what would happen if someone with that level of fear wanted to scale the old Coathanger, Sydney Harbour Bridge. Here's Shelly Horton with one such person.