BOOM. I have remembered the biggest thing I am afraid of. SWANS. Seriously, they're huge hideous water devil birds, and when you go up to them to, I don't know, make nice to them they go
"HHHHHHHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIISSSSSSSSSSSSSSSSSSSSSSSSS"
I hate swans with all of my power. I always feel a strabge urge to go up and antgonize them, and then they hiss at me and I run away.
EDIT: Alright, maybe they're not my BIGGEST fear, because there are monsters and ghosts and giant flaming balls of doom, but out of all the petty pointless things I'm afraid of, swans are at the very top.