"Revolutions are serious business," write Srdja Popovic and Mladen Joksic in Foreign Policy magazine. "Just recall the grumpy faces of 20th-century revolutionaries like Lenin, Mao, Fidel, and Che. They could barely crack a smile. But fast-forward to the protests of the 21st century, and you see a new form of activism at work."

And then have a look at Tactical Tech's own case studies focusing on laughter as a tactic.