Demons (1985)

In the movie Demons (1985), a group of friends attends a screening at a mysterious movie theater. Unbeknownst to them, the film they're watching unleashes a horde of demonic creatures. Trapped inside the theater, they must fight for their lives and find a way to escape the clutches of the demons. The movie combines elements of horror, gore, and supernatural elements to create a suspenseful and thrilling experience.