While some things are hard to explain, there are certain situations like this are just plain unbelievable. It was basically the first silent disco that ever happened, except people died. In 1518, a woman named Frau Troffea started a dancing on the streets of Strausberg, France. She had so much passion in her step that she created quite a few dancing minions. It started to trickle in and within a week there were over 30 people dancing their tail feather off for days on end. By the end of the month, the dancing vigil gained a following of over 400 individuals.
What caused such an uproar of commotion one may ask? It could have strained from illness and underlying stress. This psychosis was caused by severe famine in the region and led to numerous deaths from starvation. The area was also riddled with cases of smallpox and syphilis which caused more than enough stress and superstition throughout the town. A more plausible reason for the deaths could have been people eating extremely poisonous psychedelic mushrooms from starvation.
It is difficult enough for healthy people to dance for a couple hours, let alone days. The fact that these starving individuals were dancing for that amount of time is completely unheard of. Strangely enough, this was not the only weird plague of its time. There were seven more dancing plagues in the same region during the medieval period. A laughing epidemic even popped up for about a year and a half in Tanzania. If dancing plagues still happened around the world, it sounds like the best way to go.