Dad can’t figure out what E-Y-E-S spells, kid laughs uncontrollably [video]

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This is a simple riddle with which to annoy your friends. Have them pronounce “Yes,” then have them spell it. Then ask them what E-Y-E-S spells. They’ll be so stuck in “yes” mode that they won’t be able to figure it out, like this dad. His reaction at the end is the best.
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