"A horror movie has certain rules. If you break too many the audience will be disappointed.
This is a very short, no fluff, blueprint of how to write a horror script.
1. The Hook. Start with a bang. Step right into a suspense scene. (”Scream” opens with a terrifying sequence with Drew Barrymore on the phone with a killer)
2. The Flaw. Introduce your hero. Give him a flaw. Before you can put your hero in jeopardy we must care for him. We must want our hero to succeed. So make him human. (In “Signs” Mel Gibson plays a priest who has lost his faith after his wife died)
3. The Fear. A variant of The Flaw. The hero has a fear. Maybe a fear of heights, or claustrophobia. (In “Jaws” Roy Scheider has a fear of water. At the end he has to conquer his fear by going out onto the ocean to kill the shark)