Dancing mania (also known as dancing plague, choreomania, St John's Dance and, historically, St. Vitus' Dance) was a social phenomenon that occurred primarily in mainland Europe between the 14th and 17th centuries. It involved groups of people dancing erratically, sometimes thousands at a time. The mania affected men, women, and children, who danced until they collapsed from exhaustion.

Further outbreaks occurred during the 13th century, including one in 1237 in which a large group of children travelled from Erfurt to Arnstadt, jumping and dancing all the way, in marked similarity to the legend of the Pied Piper of Hamelin. Another incident, in 1278, involved about 200 people dancing on a bridge over the River Meuse in Germany, resulting in its collapse.

One of the biggest outbreaks occurred in July 1518, in Strasbourg (see Dancing Plague of 1518), where a woman named Frau Troffea began dancing in the street; within four days she had been joined by 33 others, and within a month there were 400, many of whom suffered heart attacks and died.

http://en.wikipedia.org/wiki/Dancing_mania

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