Burger King likes to get in the Halloween spirit with crazy food and drinks and this year the fast food chain has unveiled a "Frozen Fanta Scary Black Cherry" slushie. That all sounds good, but apparently people have been experiencing some interesting side effects from the drink.

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According to Thrillist, if you consume one of these "Frozen Fanta Scary Black Cherry" drinks, you have a solid chance that your poop will turn a blackish blue color.

This isn't a joke.


Credit:Sonoma Marten via Twitter

The drink is available until November 12, so you've still got some time to try and it and see for yourself whether the rumors are true. Just don't send us any photographic proof, we'll take your word for it.

For the whole story, check out Thrillist.