I have a few...
Semi Trucks. When I was first learning how to drive, I rounded a corner and there was a semi coming in the opposite direction and I had a full blown panic attack. I can't remember if it was my father or mother, but one of them had to steer the car off of the road for me. I still can't help but breathe hard when I pass them, or even just see them when I am not even in a car! I don't know why...
Spiders. Any size, shape or color. The sight of one has me squealing. I hate 'em!
Bees. When I was about 9 years old, my family and I were setting up a dog run and we heard this really wierd buzzing noise. We started looking around but couldn't see what was making the noise. Then we saw this black, buzzing cloud coming up over the hill straight at us. We started yelling at my older brother and cousin who were further out on the trampoline. By the time we got everyone inside we had several bees that had flown in the door, and the windows were mostly blackened. I still freak out when I see a bee.
Pike. We I was very young, my father took my sister and I swimming in the lake, and then warned us of the killer man-eating pike that lived there.

Of course, I later learned that there weren't any pike anywhere near that lake, but the association still stands.