The McDonald’s French Fry Box Flap Has A Purpose? Did y’all know the flap on your fries box actually has a purpose? pic.twitter.com/abptKfFxSB — Today Years Old (@todayyearsoldig) January 5, 2019 So is the flap on the fry box made for ketchup?YesNoVote KetchupMcDonalds French Fries SHARE RELATED CONTENT WHAT’S TRENDING: The Rock’s New Movie “Fighting With My Family” . Everyone’s Watching Tidying Up with Marie Kondo . . Are You? Bradley J’s “Things I Couldn’t Get To Today” 1/8/19 Bradley J’s “Things I Couldn’t Get To On My Show” Alpha Media Community Christmas Tree The Results Of Bradley J’s CMA Picks Are In . .