What is it?

Burger King is famous for its tongue in cheek campaigns which troll Mcdonald's and this one was a Whopper! In order to gain more downloads of their delivery app Burger King announced an ingenious campaign. They were giving away Whoppers for just 1 cent, BUT you could only redeem the voucher if you were stood in McDonalds! The app tracked your location, directed you to a McDonalds where you could download a voucher. It then directed you to the nearest Burger King.