What phobias do you have?

I was severely acrophobic when I was a kid, to the point where I couldn't even climb up the steps to the slide on the playground. On a field trip to the state capital, we went up on the mezzanine under the rotunda above the main floor, and it so freaked me out I had to walk in the exact center of the mezzanine floor without looking over the rail to the floor below.

I'm much better now, but I still have some trouble with heights.