Yes, I have acrophobia (fear of heights), but not aviophobia (fear of flying in an airplane/aeroplane) but if I were to fly the damn thing, THEN I'd excuse my French, I'd completely **** myself.
I have loads of rational fears, but what most scares me the most are arachnids (who are spiders, crabs, lobsters and the lot that have eight legs and an invertebrate). Once, when I was like 5, spiders never scared me and I read an adult book on what spiders look like, the description of their life and what to do if you get bitten by a venomous one. Then I saw one in real life five years later, and I ****ed my pants.