That's interesting to hear that it crosses age; which I would have thought to be a barrier. what do you teach?
I have trouble with "hecklers"...I often have a few who like to challenge me; partly because I'm substituting, and partly because of my smaller build. I always have to prove that I'm not a push over, and I hate to do the carrots & sticks thing. I always try to be interesting; inject current events or annecdotes from life, but I always have trouble with the few who take this as their personal challenge to derail me....sandbagging the class; as I have to take time out to dicipline if cojoling doesn't work [which eventually is the case with some].