Trust me, singing Star Wars is the least they can do. I'm 16 and I've been teaching for the past three years. I have no troubles with the adults, they look up to me, seeing as I'm the highest ranking student in our dojo (kind of sad really). The kids on the other hand can be monsters if they want to. I've heard them talking about guns, video games, toys, school, anything to avoid paying attention. There's this one kid who questions everything I do, saying, why can't we do it this way? I useually awnser that it's not the way we do it, and that people much more highly skilled than us made it that way, but he just replies that he does it that way in HIS style of karate (which is completely made up from his own imagination) Anyhow, I feel your pain.