Some people love to dance, non-stop. But what if you start and you can’t stop, no matter what? That happened to 400 people in Strasbourg, Alsace in 1518. It started off with one woman, who began dancing for 5 days straight. Within the week, 34 people joined her. By the end of the month, 400 were dancing like crazy and couldn’t stop themselves.

Eventually, they did though. Heart attacks, strokes and exhaustion killed them. Today, scientists and historians suspect a psychoactive fungus started it, or perhaps mass hysteria. Others suspect supernatural causes.

I can’t imagine starting to dance, and not being able to remain in control.