Mysterious Cases of Mass Hysteria Historians Can’t Explain

From the Mad Gasser of Mattoon to the mysterious dancing plague of Strasbourg, we look at freaky examples of mass hysteria historians can't explain. #MassHysteria #ScaryVideos #SlappedHam
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Dopplerette by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
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Evening of Chaos by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
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