At the beginning of the show, Daniel is showing a film to his class using a 16mm projector. His assistant stops the film without turning off the projector lamp, using it like a film strip to continually show a picture of Frankenstein's monster. Projector lamps get very hot, and film is notoriously flammable. Just a few seconds of projecting through a stopped film would result in burning through that frame--the classic picture of the film burning and breaking would appear on the screen.