McDonald’s restaurants are practically everywhere in the United States. Which is great…for McDonald’s. For Burger King, outnumbered 2 to 1 by the Golden Arches — not so much. So how do you compete against odds like those? By selling Whopper sandwiches “at” McDonald’s—for only a penny—with the newly updated Burger King app, relaunched with an order-ahead feature. The twist is that FCB tweaked the app to geo-fence McDonald’s restaurants so that the Whopper Detour promotion only unlocks when people are physically within 600 feet of Burger King’s biggest competitor. Needless to say, McDonald’s wasn’t lovin’ it.