On one of the levels when you are in "Hell", you will come across two gremlins trapped in cages. There is a gremlin that is in the hanging cage with the lever in front of it, if you press the lever the cage will drop down a little bit, hop down with it, and there will be another lever and a furnace. Press the lever and a giant flame will come out of the furnace and fry the gremlin! Its pretty funny.