McDonald's nixed Burger King's offer to create a McWhopper in the name of promoting peace. But executives at the company said they are leading a “multimillion-dollar” advertising campaign to promote the United Nations World Food Programme and benefit refugees of conflicts in the Middle East. For its part, Burger King teamed with Denny's, Krystal Giraffas, and Wayback Burgers to give out 1,500 mashup burgers at an Atlanta pop-up restaurant on Monday.