June 24, 1374, Aachen: An outbreak of dancing mania grips the town.
The citizens hallucinate and experience convulsions until dropping from exhaustion.
The phenomenon was widespread in Medieval Europe and known before the twentieth century as "St. John's Dance."
(Aside: "St. Vitus's dance" is a neurological disorder related to Huntington's Disease and unrelated to manic dancing.)
(Further aside: The pic is a lithograph of the Danse Macabre, also totally unrelated; it's just that I'm listening to The Faint.)
The Skeptical Inquirer has a good breakdown on dancing mania here. (Three fallacies.)
I disappear / I lost control / My body's moving / All on its own / I watch myself / Walk away / A foreign spirit / Took my place....
--The Faint, Wet From Birth, 2004
(Housekeeping: Starry D. & Severn don't blog here anymore. T.P.S.M. is a one-man show.)