Demons (1985)

"Demons" is the perfect example of what a violent and demonically possessed crowd looks like after watching one of those films that should never have been screened! Directed by Lamberto Bava and produced by Dario Argento, this classic Italian horror film from the 80's has all of the traits known for this sub-genre; gore, more gore, horrible voice overs, a sound track by the band Goblin, and an inexplainable storyline. All you need to know about this classic is that free tickets are passed out to a single showing of a brand new movie. Everyone with a ticket goes, watches the movie within the movie, and one by one the audience members become possessed by the demonic spirits that are released within the film. Those who don't turn find themselves trapped in the theater without an exit, forced to fight and kill their former loved ones.