McDonald’s fans shocked to discover purpose of doodads on drink lids

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McDonald's customers are just now discovering what the buttons and ridges on the top of the drink lids are for — and they’re lovin’ it.

A video posted on the "Today Years Old" Twitter account — a reference to the viral phrase "I was today years old when I learned … " — shows someone pushing the buttons around the straw on the lid of a drink from the fast food chain.

While many people commented that they already knew what the circular nubs are for, many were shocked to learn the purpose of the rectangular ones.

Lots of customers correctly guessed that the circular buttons were indicators of what drink is in the cup.

Each button has a label: "diet," "cola," "RB" for root beer, and "other."

But the function of the smaller rectangle buttons next to the circular ones wasn't as obvious: The ridges are used to correct a mistake if a server presses down the wrong circular button.

For example, if they accidentally push down the "RB" button instead of the "diet" button, they can click the ridge next to the "RB" circle and reset the lid to correct the mistake.

POV: your mind is blown pic.twitter.com/LMj7ppYJvw

Many people responded to the video — now with more than 2 million views — claiming that they were "mind-blown" by the revelation.

"Okay, usually I know these. I knew about pushing in the bubble, but I had no clue what that rectangular extrusion was," one person commented.

"I don't know why I would ever need to backspace but nice to know it can be done," another quipped.

"The amount of times I used to take the lid off to re-pop the bubbles…." someone admitted.

For better or worse, there's always something new to discover on the internet, and this definitely isn't the first.

Over the holidays, people freaked out about another ubiquitous item: the nutcracker.

"‘You’re telling me that nutcrackers can actually crack nuts?’ -Me, Thanksgiving 2022," one person tweeted.

In yet another revelation on the internet, people discovered a "hack" for salt grinders.

TikTok content creator Mark, who posts on the Right Guys Review account, posted a video of him grabbing a salt grinder out of his kitchen cabinet and explaining, "Do you know these salt shaker things? Well, did you know you can actually change it from fine to ground? I never knew that. Who knew that?"

He shows that pushing down on the circle in the middle of the grinder changes the setting.

"So apparently you just pop this down, and it changes it from big to small," he said.

He goes on to demonstrate, grinding salt onto his counter using both fine and ground settings.

"How am I only finding this out today?" Mark exclaimed.