Demons!

The film begins when two young women receive tickets to a free film screening at The Metropol, a newly opened movie theater. When they arrive they discover that a large crowd has shown up for the screening and they sit down to watch the movie, a violent horror film. Out in the lobby a woman has scraped herself on the face with a bizarre mask, and she notices that the mask is the exact same as a prop used in the film. She goes to the bathroom, and as she looks in the mirror the cut on her face bursts open, spewing out a foul pus. She is soon transformed into a bloodthirsty, fanged demon. Before long the cinema patrons are forced to battle for their lives as one by one they are transformed into vicious monsters. The music is amazing and includes "Billy Idol"! I don't have the soundtrack yet, but when I do I'll post it.

"Horror is the future. And you cannot be afraid. You must push everything to the absolute limit or else life will be boring. People will be boring. Horror is like a serpent; always shedding its skin, always changing. And it will always come back. It can't be hidden away like the guilty secrets we try to keep in our subconscious." Dario Argento.