Bees, bears, snakes, pooping in public restrooms, extraordinarily beautiful women, the IRS, a liberal mind-set, my wife when she's pissed, a home-improvement project requiring multiple holes in specific locations, the big room at the hospital and/or a multiple doctor visit when they start calling me by my first name.
Edit--
Forgot the bats. Even though I know we have a "deal" with them "getting out of the way at the last second" when they dip at you and stuff, it is just my luck that I'll get a stupid one or one whose radar is defective or something.
...and lightning.
They call me sparky, so that one is not especially stupid in the fear department--my friends run further from me than the storm itself, lol