St Vitus’ Dance
St Vitus’ Dance, the dancing plague is documented surfacing in continental Europe as early as the 11th Century. A form of mass hysteria, the dance could spread from individuals to large groups, all driven by an unshakeable compulsion to dance feverishly, sometimes for weeks, often leaping and singing and sometimes hallucinating to the point of exhaustion and occasionally death, like a top that can’t stop spinning.
And, in fact, one 13th Century outbreak – a literal form of dance fever – occurred in the town of Erfurt, where a group of youths were documented as wildly gyrating as they travelled out of town, ending up 20km away in a neighbouring town. Some of the children, one chronicle suggests, expired shortly thereafter, having flat-out danced themselves to death, and those who survived were left with chronic tremors.
https://www.bbc.com/travel/article/20200902-the-grim-truth-behind-the-pied-piper>>16177855