Is the McWhopper coming our way?

McDonald's and Burger King under one... burger?

Have our wishes come true? Not so fast.

In a public move to create the Ultimate McWhopper, Burger King reached out to McD's via an open letter on a full page ad to make peace for World Peace Day on Sept 21. 

What did McD's CEO have to say in response?

He took to Twitter to sound off.