The Peace Day Burger meme originated from a high-profile 2015 marketing campaign where Burger King publicly invited McDonald's to collaborate on a hybrid 'McWhopper' to commemorate International Day of Peace. The proposal included a pop-up restaurant in Atlanta staffed by employees from both chains. When McDonald's CEO Steve Easterbrook declined the offer with a somewhat dismissive response, the internet reacted with a mix of disappointment and humor. This meme is now widely used to represent massive missed opportunities, awkward corporate attempts at friendship, or any scenario where two bitter rivals are asked to join forces for a common cause.