Asking everyone to do something individually, such as examining the venous patterns of their arms, writing a haiku, or checking their own proximal space. Using the entire class thereof to teach statistical principles through polls, sampling methods, and outliers. Pros Cons Immediacy. If you get a student in front of the class, the rest will be watching. If you have everyone doing an exercise, they will be focused on the class instead of mentally wandering.
Students are more likely to remember what they have done even on video or computer.
Even seeing a peer do something will make a great impression. Absolutely no money down. Nobody likes being singled out, and an unexpected call for volunteers will make students wonder if you are planning to saw them in half. Risk of offense or hurt feelings. Keep the risk low, low, low.