Whoa! Sorry, I work in marketing ... Does In 'n' Out even have a marketing department? With that kind of press, first you alert your franchisees, then you honor orders for the burger (it's NOT like it's a difficult task) for a day or so. THEN you with good humor respond to the Twitter Kerfuffle in a lighthearted press conference at which time you offer 50 percent off for your stuff for the next eight or so hours. It's NOT that difficult!
The best thing about In-N-Out is that they don’t have franchisees.....all company stores.