Burger King’s Black Whopper is causing unexpected side effect

Burger King’s new ‘Halloween Whopper’ with a black bun is causing an unusual side effect.

It seems after you eat it, you will have a green-colored bowel movement.

People are talking about their experiences on Twitter under the #greenpoop.

Burger King says it is A.1. sauce that is baked into the hamburger bun and that gives it the dark color.

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