Lion-o, from Thundercats He stared at me every night. If I was facing the left, he'd stare at me from the right. If I turned to the right, he'd run to the left and stare at me from there. I hated him.
Tape worms "If you eat too many sugar a worm will grow inside your stomach and eat everything you swallow!"
Gulp!
Laser Pointers I got pointed in the eye with on of those things once. "AAAAAAAAIIIIIIEEEEEEEEEE!!!!"
Killer Clowns from Outer Space Clows didn't scare. Killer Clowns from Outer Space, on the other hand...
Transformers I didn't like riding in cars, because I was afraid they'd transform into robots... WITH ME IN THEM!
I was responsible for my brother's fear for closets, when I told him about a dream I had about some aliens coming out of the one in my room... He has to sleep with his closet's door closed to this day.