As a kid I was really freaking scared of bees, wasps, bumblebees, mosquitoes... anything that flies and can sting/looks like something that can sting.
For some reason I also had an irrational fear of those buggers flying into my ear. I knew they couldn't, uh, fly inside my head or something silly like that. But whenever those beasts got close to my ear and I heard them buzzing around loudly I totally lost it.
I think it was a (minor?) phobia back then. For a while I was even kinda nervous around flys, simply because they reminded me of bees and because they could fly into my ear.
I'm still afraid of bees, wasps and all those little buggers. For example, I can't sleep with a mosquito in my room. I either stay awake until I can finally kill it or hide underneath my blanket, slowly suffocating.
Also, I have a very intense fear of vomiting. I don't think it could be called a phobia, but ... yeah, it's pretty bad.