I saw this:
http://www.imdb.com/title/tt0162661/?ref_=ttmc_mc_tt when I was 9 (Sleepy Hollow with Johnny Depp, atleast I think it was this version) at my friends birthday party sleepover and it scared me so much that I didn't sleep properly for about 6 months. I was completely and utterly terrified by it and I don't even want to go back and rewatch it now although I'll realise it's a load of gooseberry fool and I shouldn'tve been scared.
I didn't sit and watch the end of it which I should've done and I left it at the bit the kid is under the floorboards. I still don't understand why I got so scared by it, it's probably really stupid. Also these two:
Goosebumps Night of the Living Dummy, or more specifically ventriloquist dummies that look like this.
The Demon Headmaster (although I couldn't stop watching it as I loved it)
and finally the stupidest is people in mascot style suits. I feel uncomfortable around them even now. There's just something daunting about people in these huge animal suits and I don't like being near them.