im just afraid of heights. fell off a double bunk bed when i was 4. the ladder slipped and fell, i fell on top of it. was major ouch. but that didnt deter me. a few days later i was jumping on a desk, fell off that too. that did it. i have been afraid of heights ever since. this fear is not helped at all by the fact that i have no depth perception. so i cannot judge distance at all. makes walking down stairs very interesting