Well I watched snakes on a plane when I was like 10 so I thought that was the scariest movie ever because 1. I'm afraid of snakes and 2. I'm afraid of flying. Except now that I've seen it again I've realized it's really not that bad. But every other scary movie I've ever seen scared the crap out of me cuz I'm a wimp and usually watch them from under a blanket XD
I have to agree with farmerjohn and fatkenny. 'It' and 'The Shining' are the scariest ive ever seen even tho my first was some low rated flick called 'Gargoyles' when i was twelve. Haunts me to this day so i get creeped out driving down dark country roads at night alone.