Flash mobs give (often random) strangers the chance to make new acquaintances and even friends. The idea is very simple: promote a large group of people to do something very random and basically in unison for—according to Wikipedia— “…the purposes of entertainment, satire, and artistic expression” and even, perhaps, putting a smile on the faces of totally unsuspecting bystanders. Prominent examples include the Worldwide Pillowfight Day’s 5,000-person flash mob in New York City in 2008 and the 4,000-person Silent Disco flash mob at the London Victoria station in 2006. Jessica