Well I've only read over half of IT and a few Goosebumps books when I was a kid and it depends on how well it's written. You also have to invoke some kind of response in the brain that sends it into fight or flight mode even though it's just a book. Eventually I just put IT down and stopped reading it because no matter how much I love horror, it was pretty boring for my tastes. I do plan to finish it but not yet. The only thing that even partially gave me the creeps (which was only for like five minutes) was when Beverly was cleaning the bathroom and the kids were calling to her.