Flash mobs have been used by a number of organizations and issues, ranging from environmentalism, free political prisoners movements, and issues of corporate wrongdoings. The "One People" flashmob by Occupy San Francisco/Oakland was a staged performance that illustrates the "one percent's" inevitable isolation caused by systematically alienating the rest of the population. The initial performance itself involved a couple hundred people, including onlookers, but then went viral, gathering thousands of views as well as being remixed to incorporate additional global protest footage.
The Yes Men and their films are a quintessential example of modern political pranksterism. They're pranks often involve spectacles of absurdist claims and outrageous costumes. But what's more striking is their ability to perform these pranks within spaces that are reserved for the corporate or political elite. They play the part of corporate representatives and go on live television interviews or give keynote speeches at conferences in order to expose the more nefarious sides of the companies that they're pretending to represent. The results of these acts have sometimes caused major publicity or financial scandals for those companies.