What’s Going On in Your Body When You Watch a Horror Movie

It's triggering your fight-or-flight response

At the same time you're yelling at the stupid heroine to run already, something is being triggered in your own brain: your fight-or-flight response. There's a reason you're so mad at the on-screen idiots who have clearly never seen a horror movie, and that's because your own basic, biological responses are putting you right into survival mode.