Pop quiz: What do Burning Man, Fight Club, flash mobs, urban exploring, art cars and the Billboard Liberation Front have in common? All of them were born of the pranksters known as the Cacophony Society. They started in San Francisco, 1986 and expanded to have chapters in Detroit, Portland, Los Angeles, and dozens of other cities. With April Fool’s Day approaching I knew I’d want to share some stories from this incredible group.