Even though this film is 56 years old, automotive starter motors really haven't changed much. If you're unfamiliar with how a car's starting system works, this could help you understand how it works, and more importantly, how it can malfunction.
One of the most important parts of fixing your own car is trying to learn as much as you can about how it works. So get down to basics with Uncle Sam, maggot! He's got something to teach you that might help you diagnose your car next time the starter goes AWOL.
(Hat tip to mrguy037!)