Got to be convince someone or a few innocent, young by-standers that the world is ending. Could maybe have a small group of student in an interview situation, maybe in a waiting room. Then you could play reports on news brodcast of mass casualties and disasters happening across te globe. Then after being exposed to that for maybe 10-20 mins they could cause a earthquake and outside there could be building crumbled. Pretend car crashes and causualties outside and smoke machines blowing red smoke around the scene. The climax could be some kind of devil man appearing on he scene. Would totally freak hem out!! And be a class act to watch.