Uh oh, Burger King’s black Halloween Whopper has spooky side effect

Burger King may have had good intentions when it unveiled the black Whopper for Halloween, but it looks like it comes with some spooky side effects. According to a number of Burger King patrons who have indulged in the fast-food chain's signature burger, the sandwhich goes in one color (black buns) but comes out a surprisingly different one — green.

Social media sites like Twitter are filled with consumers posting about the unintended side effects of the burger, some even providing visual evidence. It's even spawned the hashtag "#GreenPoop."

Given the nature of social media, and thow things often get blown out of proportion, it's unclear how widespread the green poop problem is. There are definitely a number of people claiming to have fallen victim to the green poop, but you can't really tell which complaints are authentic unless, of course, they provide the images — which some, unfortunately, have. Some claim the burger has had no effect on them.

Regardless, the hashtag has spawned some pretty comical reactions. That is, as long as you're not the one suffering from it.

Sounds like more of a trick than a treat to me.

Burger King hasn't responded to the #GreenPoop, but did previously tell ABC News that the black bun contains less than one percent of food die. The company also writes in its nutrition facts that flavorings and food colorings used "are commonly used in the industry and within the safe and Acceptable Daily Intake (ADI) approved by the Food and Drug Administration (FDA)." It does not specify which colors are used, but Medical Daily reports that green dyes are often used in black food coloring.

And yes, you can find the visual evidence on the next page.