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.
Despite Doc's death before the events of Cars 2, he actually appears in Cars Land in Radiator Springs Racers. After getting tires from Luigi or a paint job from Ramone, you'll meet Doc, who is your crew chief for the race. During the race, Doc will tell you through his headset some racing directions.