Black buns are on the menu at Burger King, all in the name of Halloween fun, says the washingtonpost.com and the dailymirror.
But there’s a side effect being reported all over the Internet: The black bun is causig people’s bowel movements to turn green, "a comical, cartoon green,” someone Tweeted .
According to the Daily Mail , a Burger King spokesman said the black bun is colored with less then 1 percent dye, and A-1 sauce. In Japan, it swaps out A-1 for squid ink. The Washington Pos t, however, thinks dye is to blame.
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