A professor who’s writing something on the board hears something and turns back to look at the class. He stares in growing incomprehension as a few start tapping on their calculators, then begin pounding their fists on the desks, bobbing their heads, and making music with their stationery, not sparing even the scissors, and was that a ruler or a piece of laminate stripped off the desk? By now it’s clear that this is all part of a plan.