Navin R. Johnson is the white adopted son of black Sharecropping, who grows to adulthood naïvely unaware of his obvious adoption. He stands out in his family not just because of his skin color but because of his utter lack of rhythm when his adopted family plays spirited blues music. One night, he hears the staid Roger Wolfe Kahn Orchestra song called "Crazy Rhythm" on the radio and his feet spontaneously begin to move with the urge to dance; he sees this as a calling and decides to hitchhike to St. Louis, from where the song was broadcast. On the way, he stops at a motel, where a dog wakes him up by barking at his door. Navin thinks the dog is trying to warn of a fire. He wakes up the other hotel guests to rescue them, telling the dog they will name him "Lifesaver." After everyone realizes it was a false alarm, one of the guests, an angry Asian man suggests not naming the dog "Lifesaver" but rather, "ShitHead." Navin agrees, and refers to the dog by that name throughout the film.