Lamberto Bava's 1985 cult classic Demons (Dèmoni), produced by Dario Argento, is a quintessential 80s splatter film defined by its "movie within a movie" premise and intense practical effects by Sergio Stivaletti. The plot follows a trapped audience in a West Berlin cinema transforming into demons, famously featuring a heavy metal soundtrack. You can find more information about the film on IMDb. Demônios (2006) - Notícias - IMDb