Springfield, Missouri, USA - February 18, 2011: An isolated container of McDonald's French Fries distributed by McDonald's Corporation.

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Here’s Real Purpose For The McDonald’s French Fry Box Flap

January 15, 2019 | Rick Hall

Someone on Twitter just posted that the cardboard flap on the top of a McDonald's French fry box has a functional purpose.  You're supposed to fold it back . . . and use it as a place to put your ketchup.  Who knew?

Somehow I'd end up spilling all of this ketchup on my clean shirt.

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