Fever Magazine

Burger King Black Whopper causes '#greenpoop'

Ajah Cruz-Morales

Burger King's new "Halloween Whopper" with a black bun has some scary side-effects. It appears after you eat it, you have... well um... goblin-y green bowel movements.

People took to Twitter to speak about their experiences, using the hashtag #greenpoop.

Burger King official explained the phenomenon simply by saying the cause is the A-1 sauce baked into the burger bun to give it the particular dark color.