People who never got scared just because they couldn't get immersed in a movie or book, but finally found something that scared them, what was it?

I've consumed a lot of popular horror as well as more obscure horror that was highly recommended, and in general some horror that sounded like it might get to me. I just don't get scared by it and I think it's because I don't get immersed. I enjoy the story and everything that comes with it but not for one second do I forget that it's fiction, or that it's something that isn't happening to me right now.

I'm not scared of ghosts or creatures, I don't really know what my phobias are and I have a very strong stomach so it's extremely hard to trigger me. I'm looking for something that either breaks the standard or has a good twist to it. I would like something that could possibly get me immersed or can hook me from the start before my conscious mind knows what's going on.