In the summer of 1518, a bizarre phenomenon took place in Strasbourg, France. A woman named Frau Troffea began dancing in the streets, and soon dozens of others joined her, unable to stop despite exhaustion, dehydration, and even broken bones. Over the course of several weeks, the so-called "dancing plague" spread, leaving hundreds of people writhing and convulsing in a bizarre display of mass hysteria. In this podcast, we explore the possible causes and effects of this mysterious event, and what it reveals about the power of suggestion and the human psyche.