Possums! I know they won't go out of their way to attack but they scare they poop out of me.
Also needles, but just like another member when I was 12 nurse (trainee I thinik) stabbed me about a dozen times, my mom told her to stop because I was about to pass out and when the nurse did pull out the needle blood squirted up all over the place.
I'm also afraid of blood, deep bodies of water, drunk drivers (Ive been hit twice!) and commitment. (Damn you Corbin!)