Okay, so we're filming along, and I'm noticing some of the cast is becoming slightly--bored of the whole process. What is a good way to motivate (they're both almost teenagers, 15 and 12) them cheaply? I've got only a few days more to film, and without proper motivation, the film will not get completed (WHICH IT WILL....). The cattle prod short-circuited after the first hundred prods. Any ideas?