E ler a wikipedia deixa tudo isso ainda mais claro. Veja os exemplos abaixo:
- The Dancing Plague (or Dancing Epidemic) of 1518 was a case of dancing mania that occurred in Strasbourg, Alsace, France (then part of the Holy Roman Empire) in July 1518. Numerous people took to dancing for days without rest, and over the period of about one month, most of the people died from heart attack, stroke, or exhaustion.
- The Tanganyika laughter epidemic of 1962 was an outbreak of mass psychogenic illness (MPI) rumored to have occurred in the vicinity of the village of Kashasha on the western coast of Lake Victoria in the modern nation of Tanzania near the border of Kenya.