Factor, one of my teachers tried to do more than that today. I was in the classroom next to his, and we could hear him, and throughout the lesson it seemed as though he was trying to teach the whole curriculum, even subjects not taught at the school! At various points he mentioned stuff to do with; biology, chemistry, history, religious studies, electronics and even german! Although only a couple of the things seemed to be relevant to the lesson which i think was about symmetry!
Sorry jeans for hijacking your thread xx molly at least i answered your question.