Pelé and Maradona. DC and Marvel. Burger King and McDonald's. Some things aren't supposed to be together. Or are they? Thanks to the delivery app Rappi, Burger King embraced the chaos. With the help of DAVID São Paulo, the brand was able to pull off the first ever sale of a unique combo consisting of items from Burger King and its biggest rival; only made possible through a partnership with Rappi. During the campaign, for every Whopper ordered from Rappi’s app, a courier went straight to a Burger King restaurant, picked up a Whopper, then made a stop at a McDonald's restaurant on the way, picked up a side of McDonald's fries, and placed them together as one single order: the Impossible Combo.