Some shampoos cause a tingling sensation. Scalp tingling may occur as a result of an allergy to a hair product. Some people might also experience scalp tingling from excessive scalp picking and scratching. People who experience regular migraines often complain of a tingling scalp.
While a few of the buildings in Radiator Springs are exact replicas of landmarks along Route 66, most of the businesses populated and operated by the automotive characters in the movie are a pastiche of places found along the fading but still popular road.
From the Blu-Ray Guide: Doc Hudson is a car of few words but many talents. He not only serves as the town judge, he's also Radiator Springs' resident doctor. Doc is respected and admired by the townsfolk for the way he looks out for their health and tends to their aches and pains.