This is my first year teaching high school - I have taught elementary school for the past 17 years. My question is, what are some good methods for getting the class' attention? In elementary school, we clapped, chanted, counted - I had lots of tricks, but I don't think they are appropriate for high school. I have large classes - some at 41, my smallest is 38, so I need some way to get their attention quickly that will not seem juvenile to them, and that won't require me to have to shout above them. I've been using the "class, yes" method from Whole Brain Teaching, which works for some periods, but others it doesn't. Any advice?