The Cabinet of Dr. Caligari
Part of it is that you are supposed to pick one scene from the film and then elaborate on it. Use the scene near the end where Dr. Caligari enters the room and Francis has to be restrained by the hospital orderlies, and the trick ending is fully revealed (this starts at around 1:14:00 on the YouTube version that ). Using something related to the ending might be nice because it was possibly the first film to use that device (as well as the “unreliable narrator”). https://m.youtube.com/watch?v=ahezf-gk8jQ