The San Diego Union-Tribune looked into this effect on eight county restaurants Guy visited for his Diners, Drive-ins and Dives show. The response was so overwhelming that three of the restaurants have opened up second locations, and it's easy to tell when a rerun has been on (hint: they get even more crowded).
Guy is a busy guy these days, what with his Food Network shows, a game show, and his own restaurants too. But for local restaurant owners his biggest effect is when he comes to town, hungry, and with his sense of wonder for local versions of food.
Want to experience the Guy Fieri effect? Use our TV Food Show Restaurants map to find the nearest restaurant.