Generating participation in a large class discussion is fraught with teaching land mines. We can call on people who raise their hands, but too often it is always the same people. We can ask to hear from someone else and risk offending those who have been volunteering, so that there are even fewer hands. We can call on people randomly and risk embarrassing those who aren’t prepared or don’t understand. Maybe that will motivate them to prepare, or it may just be reflected in our teaching evaluations. I’d like to share an exercise that broadens class participation and offers a way around these potential risks.