During medieval times

Dancing Plague:

During medieval times, an eerie and inexplicable phenomenon known as the "Dancing Plague" occurred in several European countries. Throughout history, there have been instances where people, seemingly without any control, would start dancing uncontrollably in large groups. This bizarre ritualistic dance would continue for hours, days, or even weeks. It was believed to be a form of mass hysteria or a psychological disorder, but no conclusive explanation has ever found.