Horror films commonly use close-up shots to create atmosphere and increase audience fear by showing character facial expressions. Close-ups reveal emotions and create emphasis, according to film theorist Goddard who believed they were invented for tragedy. Extreme close-ups, as in Hitchcock's shower scene in Psycho, add dramatic effect. For a horror film trailer, the document author will use various close-ups of the main protagonist only to increase audience involvement and tension as she is in danger.