Spiders...There is just no reason, for these little eight legged terrors to ever walk the face of this earth. People say they kill other bugs, well that's great, but so do praying mantises, birds, and so much else, but I don't see them biting people and poisoning them to death....
on a slightly related note, with the exact some rant, changing the species and location around: Jellyfish.
The only other "phobia" I have is not feeling prepared. At times I am terrified of going into situations I don't understand without being prepared, however not understanding the situation I don't know what to prepare for and I over compensate for situations that are totally unrealistic. I am sure there is a word for that.