I agree with a lot of what others have said - I watched IT when I was 12 and would not go into a dark room for years - plus I now have a fear of clowns, that blood will come out of a sink and also a fear of looking into a mirror above the bathroom sink (why oh why does every film have a nasty surprise when people do that!). Our bathroom sink is fortunately under a window - so the mirror is off to the side!
I also hated the strangers (especially when they say the reason for doing it at the end of the film - scary coz it could happen!), I also hated creep and will not ever watch it again.
I agree that the noises in the grudge are scary - but Ethan makes a sound just like it which is really unfortunate!! And I hate the juddery movements in the ring. Having said that I've watched both of them about 3 times lol.