A Thousand Clowns, a 1965 film based on a play by Herb Gardner is one of the best ukulele films out there.  Murray Burns is an out of work comic writer who doesn’t want to be stiffed by “the man” or conform to society.  As a token of his rebel spirit he plays a ukulele.  However, he also has a nephew which a pesky social worker wants to take away from Murray if he doesn’t get a job.  The movie has a number of ukulele moments, but That’s My Baby, is a great one.