Burger King has a limited time offering, the “Halloween Whopper”, so called because the bun is baked with A-1 Sauce, turning the bun black. Now people are discovering that whatever coloring is used to make the bun black also changes the color of something else, turning it bright green; what is it?

Well, it’s the waste of the person who consumed the bun. People are reporting their solid waste is almost neon colored, just like the effect of eating black licorice. So you’ve been warned.