Here's Why Some McDonald's Cup Lids Have Rectangular Buttons

Frequent McDonald's customers may notice that McDonald's cup lids have rectangular buttons. Here's why the buttons exist!

People Are Freaking Out After Discovering What The Rectangles On McDonald's Lids Are For

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People are only just realising what the secret buttons on McDonald's cups are for

Soda fans are shocked to discover purpose of doodads on drink lids – New York Post

People are only just realising what the secret buttons on McDonald's cups are for

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McDonald's workers share what the 'buttons' on its drink lids really mean

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What does the 'P'on the McDonald's soda cap stand for? - Quora

Why there are buttons on McDonald's drink lids - Daily Star

McDonald's drink lids have 'buttons' on - but why, and what do they do? - Liverpool Echo