In 1518 there was a DANCING PLAGUE in Strasbourg, France. 400 people danced uncontrollably for A MONTH, dozens of lives were lost and NO ONE KNOWS WHY.
It all started when a woman named Frau Troffea decided to start dancing in the streets in July of 1518. What ensued was an inexplicable city-wide dancing craze, where hundreds took to street dancing. By the end of the month-long dance-off dozens had died from heart attacks, strokes, and exhaustion. Scientists to this day have no explanation for why this happened.
Theories suggest that people were suffering from mass hysteria brought on by distressing conditions, or that they were being punished by the wrath of Saint Vitus, or that people had been consuming a chemical with similar properties to LSD.