It began in August -- five photographs of what appeared to be a sinister figure dressed as a clown loitering in a Green Bay, Wisconsin parking lot went viral. Eight days later, a local filmmaker admitted this was just an attempt to garner PR for an upcoming indie film... but the clowns kept coming. In the space of just a few months numerous people around the world reported being attacked or stalked by clowns. So what exactly was going on?

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