What happens when you watch horror movies? Will you die from a heart attack, or become possessed and levitate and eat people? Nah. It’s all lies. You can die from a heart attack, but no. Unless you like to do some weird stuff, you most likely won’t be possessed. Now they can maybe make you crazy and anxious but you won’t have demons. Or you at least don’t get the demons from the movie. 

When you watch horror movies, your brain might have PTSD or something that can trigger you and horror movies can cause that. They can trigger past moments and make you act crazy as if you were possessed,  but the demons cant come through the screen.