Short Suck #23 - The Weird But True Dancing Plague of 1518

What a tale I have for you today! In 1518, a very peculiar form of madness fell over the people of the city of Strasbourg (modern day France) in the Holy Roman Empire. People started... dancing. A lot of people. As in hundreds. And out in public in full view of anyone who wanted to watch! And many of them only stopped when they died. They literally danced themselves to death. What happened and why???