The Dancing Plague of 1518

In 1518, a woman in France started dancing in the street. She couldn't stop.

Days passed; she kept dancing. Then more people joined her, 400 people,

all dancing uncontrollably. For weeks, they danced until their feet bled, until they collapsed

from exhaustion. Dozens of them died still dancing. Doctors had no explanation. They just kept dancing.

To this day, nobody knows why. It's called the Dancing Plague, and it actually

happened.