Wait . . . the McDonald's french fry box has had a secret, built-in spot for ketchup all these years?
And we've been missing out on a hidden feature of McDonald's French fry boxes for our entire lives?
Someone on Twitter just posted that the cardboard flap on the top of the box has an actual functional purpose. You're supposed to fold it back . . . and use it as a place to put your ketchup.
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