Why do we watch horror movies?

Usually, we see fear as a negative emotion which shouldn't last any longer than it is supposed to, which is true. But when it comes to horror movies, most of us can't seem to get tired of them even when they're so scary. This puts curious folks like you and me into questioning the psychology of horror movies and why do we watch them. The answer is not simple, but there are some theories and studies to give us an idea of what's going on.