A sudden outbreak of <a href="https://en.wikipedia.org/wiki/Dancing_mania" id="mwWQ" rel="mw:WikiLink" title="Dancing mania">St. John's Dance</a> causes people in the streets of <a href="https://en.wikipedia.org/wiki/Aachen" id="mwWg" rel="mw:WikiLink" title="Aachen">Aachen</a>, Germany, to experience <a href="https://en.wikipedia.org/wiki/Hallucination" id="mwWw" rel="mw:WikiLink" title="Hallucination">hallucinations</a> and begin to jump and twitch uncontrollably until they collapse from exhaustion.