https://en.wikipedia.org/wiki/Dancing_plague_of_1518
In 1518 the citizens in what is now France just started dancing in the streets until they dropped from exhaustion. The most logical explanation is ergot poisoning.
Just imagine, in a small village, many of the citizens just dancing to no music or prompting. Just dancing and dancing. At least they did not get run over by cars that had not been invented for a few centuries more.