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Becuase there used to be an ancient story of a monsterous obease man who would go around eatting all the people. After he devoured the human he would yawn. They saw this as disrespectful and thus eventually destroyed the beast.

People knew about this story all over and began to see others yawning as impolite. It evolved from this story. Its called Tomonus Monstrousis.

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15y ago

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