I hate to see a glazed-over look on my audience's faces, so I try to prepare a lot and ahead of time, and always inject humor where applicable/appropriate. I love using the TED videos to inspire my classes to think about events and situations OUTSIDE of the classroom and away from our small, isolated little valley in Western Colorado. I keep my energy level high and use periodic group or independent processing and application assignments to renew my own energy and get them thinking about the topic. I have learned many tricks from others, and these seem to be the most important. Mix it up, keep it relevant. Make it FUN!