There was an instance of mass hysteria in history when a group of 400 people began to dance and couldn’t stop. They danced until people started dying. Another instance of hysteria happened in a town, but this time it was because of laughter. They laughed for 16 days straight.Submit your stories: popmediaagency@gmail.com Get 55% off your Babbel subscription at babbel.com/popOur Instagram page: @reddit_explains

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