PC: Wikimedia commons On a day in July 1518 Frau Troffea, a resident in Strausbourg, France began dancing  in the street. Little did she know she would be dancing for weeks nonstop.. She was unable to stop herself from dancing and within few days 33 others accompanied her as well. Within a month the number of nonstop dancers reached 400 and authorities were alarmed. The only explanation they could come up with was demonic possession and hot blood and they arranged two guildhalls and musicians to facilitate dancers. Many dancers collapsed from exhaustion and some people died from heart attacks and strokes. By September the remaining dancers were sent to a mountaintop shrine to pray for absolution.