yawn effect

when someone yawns, then another person yawns, and another, and another, and so on; often occurs in classrooms

I yawned in class. Then Billy yawned, then Kaitlynn, then Alex, then Jill... A perfect example of the yawn effect.

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The Yawn Effect

Effect after one person yawns, similar to the Butterfly Effect.

After I yawned, it seemed as if the entire room was yawning. I had just accidentally started The Yawn Effect.