WARNING: THIS POST MAY PUT YOU OFF YOUR BREKKIE. The burger in question is the Whopper, and - in short - it turns your sh*te neon green. Surprisingly enough, it's not the black burger bun that's turning consumer's poo green; it's the mysterious sauce. 

The "Goth Whopper" has caused the term #GreenPoop to trend on twitter, motivating people to post pics of their purchase before - and after - consumption. Don't worry, we'll spare you the toilet bowl shots being shared on Instagram.

On the whole, those who've eaten it have given the experience the thumbs up, with calls for it to be reissued for St. Patrick's day. 
 

I wonder how many black bun Whoppers @BurgerKing sold today just because you sick SOBs wanted to see your poop turn green. 😂 #GreenPoop

— Spicy (@spicypants) October 7, 2015

Would you eat one, just for the craic, like?