It started with just a few people dancing outdoors in the summer heat. Arms flailing, bodies swaying and clothes soaked with sweat, they danced through the night and into the next day. Seldom stopping to eat or drink, and seemingly oblivious to mounting fatigue and the pain of bruised feet, they were still going days later. By the time the authorities intervened, hundreds more were dancing in the same frenetic fashion.
This was not one of those '80s raves in a remote, muddy field. Rather, it’s one of the oddest epidemics to be recorded in world history. And it happened 500 years ago this summer in the French city of Strasbourg. It was there, over the course of three roasting-hot months in 1518, that several hundred people developed a compulsion to dance. The dancing went on and on until – to the horror of the crowds who gathered to watch – some of them collapsed and perished on the spot!