These days, people dance 'til they drop for fun, often at competitions for prize money or other rewards. But in early 16th Century Strasbourg, a town now situated along the French-German border, dancing 'til one dropped took on an entirely new meaning when a so-called dance outbreak swept through the city and its environs, affecting hundreds of people and even claiming the lives of several victims. What caused this mysterious outbreak? Was it, as they thought at the time, the work of the Devil? And how did it finally end? Discover the answers to these and other questions in this week's truly unsettling episode.