How do the Doughboys hosts match their guests with fast-food restaurants?

On their podcast Doughboys, Mike Mitchell and Nick Wiger are joined by special guests to review chain restaurants from all over the country. In the past, they’ve had on Jason Mantzoukas to discuss the upscale sushi chain Sugarfish, Noël Wells to weigh in on Chick-Fil-A, and John Hodgman to talk about an Arby’s outing. We asked Mitchell and Wiger how they match celebrity guests with the restaurants they review.