The Dancing Plague of 1518

This is not your mama's dance party.  Or at least we hope not. The dancing plague of 1518 involved bloodied feet, broken ribs and even death. What started as one woman's mysterious dancing through the streets quickly escalated to something that baffled church officials and physicians in Strasbourg, France and over the course of two months grew out of control. What would cause people to dance until they literally dropped?