What I did: Watched the movie "Independence Day"
What I Learnt: The movie, when you see pass the jam-packed action in the film, the underlying message is quite touching and shocking. Near the climax of the movie, presidents and ministers from all over the world unite, their combined armies taking on the fleet of alien spacecraft. Through the combined might, the world's armies fought off the alien fleet. This is a message that the director wanted to bring across, despite our disputes, when facing a common threat, the only thing that can overcome it is the combined will of the whole of humanity to survive, as one.
Summary: Many movies have underlying messages, most in relation to the main story.