They were the unlikeliest of pairs—a handsome crooner and a skinny monkey, an Italian from Steubenville, Ohio, and a Jew from Newark, N.J.. Before they teamed up, Dean Martin seemed destined for a mediocre career as a nightclub singer, and Jerry Lewis was dressing up as Carmen Miranda and miming records on stage. But the moment they got together, something clicked—something miraculous—and audiences saw it at once.Before long, they were as big as Elvis or the Beatles would be after t...