Horror films aim to frighten and alarm audiences through invoking our deepest fears and using shocking finales, while also entertaining. Some key elements that make horror movies scary include fear of death, unknown threats hidden in the dark, creepy creatures, haunted places, unsettling music, suspense, dismemberment, unlikeable characters, and strategic use of lighting to suggest unseen dangers. Effective horror movies employ many such techniques to terrify yet captivate viewers in a cathartic experience.