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What are the pop up buttons for on your plastic cup lids that you get at fast food restaurants? - Quora
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McDonald's workers share what the 'buttons' on its drink lids really mean | Daily Mail Online
Rick's Food Critique: Sonic top confusion
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McDonald's workers reveal what all the mystery buttons mean on the drinks lids | The US Sun
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McDonald's workers reveal what the buttons on drink lids are really for | Metro News
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McDonald's workers share what the 'buttons' on its drink lids really mean - Mirror Online
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