I had a scheduled absence, and a need for Calculus students to occupy themselves for 90 minutes. Amid their normal Throwback Thursday routine, I had them create some art.
Take some colored paper, and demonstrate the four major derivative rules: power, product, quotient, and chain. A generic example, specific example, and written explanation were required.
Pretty pleased with the results. General consensus is that AP = lecture format. Boo to that. Sadly, something so simple presented at your average Calculus workshop might be a little too mind blowing.