How The Laughing Plague Infected an Entire Village

This video is no laughing matter. We've uncovered some rare cases of a "laughing disease" that is contagious and can spread from town to town, but what is really the cause of the laughing disorder? In today's weird video we're going to look at hysteria and some other factors that can lead people to laugh uncontrollably and end up with some serious health problems.

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