Burger King is firing up a kooky deal for customers today that will leave them saying, “Cara Mia.” To celebrate the release of its featuring items inspired by “The Addams Family,” the fast-food chain is running a buy-one, get-one-free deal on Whoppers for one day only. More specifically, rewards members can get a free Wednesday Whopper, aka a classic Whopper served on a purple bun.

Here’s everything you need to know to score the spooky deal. Participating U.S.

Burger King locations will offer a to rewards members on Thursday, Oct. 17, which just happens to be the day when an will reach peak fullness. The offer, aptly marketed as Uncle Fester’s Full Moon Feast, is valid while supplies last, and purple buns aren’t guaranteed.

Rewards members who purchase one Wednesday’s Whopper at regular price on Oct. 17 will get another for free. The limited-edition menu item is basically a traditional Whopper, but served on a purple bun that gets its color from purple potatoes.

The BOGO deal is only valid on the Burger King app and website for order ahead or dine-in. Rewards members can use the six-digit “My Code” located in their rewards account (where available) and activate the offer in the “Offers” tab to score the deal. As always, price and participation can vary and upsizes/modifications can cost extra.

Rewards members are limited to one offer per account and the deal can’t be combined with other coupons or offers. Lastly, the offer isn’t valid in Alaska, Ha.