TIL Burger King sold a burger with so much food coloring that it turned people's poop bright green

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Why the black Whopper turns your poop green

https://www.usatoday.com/story/news/nation-now/2015/10/08/why-black-whopper-turns-your-poop-green/73623596/

Black burger goes in. Green poop comes out?

Why the black Whopper turns your poop green