People Who Eat Burger King's H.A1.LOWEEN Whopper Report Unexpected Side Effect

People are saying on social media that Burger King’s new H.A1.LOWEEN Whopper has an unexpected side-effect.

Consumers of the burger, which features a black bun for the holiday, took to social media in droves to claim it turned their excrement green.

The idea of the burger came from a similar one sold at Burger King restaurants in Japan. It features the bun that has A.1. sauce baked inside.

Despite the burger being black, people are tweeting that it returns another color. One person on Twitter described it as “cartoon green."

Burger King didn’t respond to NBC Chicago’s request for comment.

Here’s what people are saying:

https://twitter.com/ImHunterStanton/status/651051900553424898
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