We finally know what those rectangular 'buttons' on McDonald's drink lids are used for. The Real Purpose Behind the McDonald’s Drink Buttons Has People Losing It Skip to main content ...

Essentially, the rectangular buttons serve as a sort of reset. If a McDonald's worker were to accidentally press the wrong circular button and label the wrong beverage, ...

While many people commented that they already knew what the circular buttons were for, many were shocked to learn the purpose of the rectangular ones. TikTok/mckeenike1121 See Also ...