Irrational fears?
I don't really know how to describe this fear, but I suppose I'm afraid of...large things.
When I was little, I used to go to an IMAX theater in LA where they would show the hundreds and hundreds of speakers behind the giant screen--and that would always scare the crap out of me. I'm terrified of blimps and pictures of large sunken ships. [The images of Titanic and of the sunken ship memorial in Pearl Harbor makes me shudder.]