You can get a Free Whopper at Burger King for National Burger Day!
Simply download the Burger King app for iOS or Android and scroll down until you see the offer that says “national burger day”(looks like the above image). Click it and enter code: LUCKYWHOPPER. Then close your app and refresh your offers and you’ll have an offer to get a Free Whopper at Burger King. It will be valid until June 2.