Puppets. I loved them on TV, but then I'd see them in my nightmares, and that certainly was a bad thing. I couldn't watch a Chucky movie commercial without closing my eyes.
I was also terrified of wasps, my brothers sneaking up on me in the dark, scorpions, bats, and tarantulas.
Now, only scorpions still scare me, but wasps and renegade puppets still creep me out.