The new film, "Baghead," is about a group of friends tormented by a villain with a bag over his head. It’s both a comedy about filmmaking and a spoof of the horror flick genre. Mark Duplass is director; Greta Gerwig and Ross Partridge are two of the film’s stars. "Baghead" opens today, Fri. 7/25, at the Landmark Sunshine and the AMC Empire.