Burger King is celebrating Halloween with a Whopper surrounded by a witch-black bun spiced with A.1. Thick and Hearty Sauce.

Burger King claims its Halloween Whopper is “deliciously dark” and  “scary good,” but what it doesn’t tell you is what happens at the other end of the digestion process.

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Google “black bun Whopper” and you will see green. Why? Well, this is a family website, so let’s just say the black coloring of the bun has “colorful” aftereffects. The green surprise that follows eating the black bun is more Christmas-y than Halloween, but then again it’s a perfectly ghoulish ending to a gnarly looking burger.

 “Scary good,” is how Burger King describes its Halloween Whopper, but the scariest thing is what happens at the other end of the digestion process.

The black bun idea came from Asia, where Burger King has been selling black ninja burgers since September 2014. Burger King outlets in Japan have been selling the Kuro Diamond and Kuro Pearl (“Kuro” means “black” in Japanese) with buns and slices of cheese blackened with bamboo charcoal, meat blackened by heaps of peppers and a black sauce made of squid ink.

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Blackened charcoal might work in America, but squid ink? That seems fairly fishy, but upon investigation on Saturday, this writer found three Burger Kings in Honolulu and Kapolei that were sold out of the black bun.

“Shoots brah,” said the voice on the loudspeaker at the Kapolei Burger King. “We ‘wen sell choke of da kine Whoppah. All pau!”

That translates to, “We apologize sir, but this Burger King franchise has sold so many of the special black-bun Halloween Whoppers: They’re all gone!!”

Driving up the west side of Oahu toward Makaha — fearing that all the black buns at every Burger King on Oahu were all pau (sold out) — the Burger King in Waianae still had a supply of the special Halloween treat.

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And it was good.

The bun was deliciously dark and spicy with the A.1 sauce, and it surrounded a typically excellent Whopper at a Hawaii-elevated cost of $6.84. It delivered all the advertising promises: “A quarter-pound of savory flame-grilled beef topped with melted American cheese, ripe tomatoes, crisp iceberg lettuce, creamy mayonnaise, A.1. Thick and Hearty Sauce, crunchy pickles, and sliced white onions on a soft sesame seed bun with A.1. flavor baked into the bun.”

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Looked scary good. Tasted scary good. But is it good for you?

“The A.1. sauce and the allowable amount of food dye in the black bun Whopper should not cause much concern in regards to both food safety and nutrition content,” Seattle-based food nutritionist Lilani Estacio told LifeZette. “The other ingredients — beef, cheese, and sauce — are what contribute to the higher caloric and fat value.”

So the Halloween-special black-bun Whopper passed the taste test.

But what about the waste test? What about all those rumors lighting up the Internet that involve the color green?

Well, you’ll just have see for yourself. The Halloween special black-bun Whopper will be on sale through Halloween.