Regarding IT...the book was FAR scarier... I remember looking over the top of the book as I was reading....praying Pennywise wasn't at the foot of my bed....shiver.....
As far as movies go...for myself it's the original Friday the 13th. I still have some residual fears from it. My dad was not really thinking and let me watch it 2 weeks before I went to camp for the first time.....
Let's just say....as much as I LOVE the water....I did NOT participate in the water stuff.....