
McDonald’s lovers had their minds blown after seemingly learning the purpose behind the buttons on the top of drink lids.
This week, a video posted on the popular Twitter account Today Years Old went viral after it showed the reason for those fun-to-pop buttons on every McDonald’s soda. The plastic buttons – sometimes labelled “Diet”, “Cola”, “Tea”, and “Other” – allow workers to indicate what the customer ordered so that they’re given the correct drink.