Kung Fu Hustle
You see, it begins with the two main characters attempting to be thugs. The people of the town are revealed to be unbelievably tough, especially the older individuals. But this old generation has weakened over time and cannot defeat the assassins sent after them. The hope lies in the young, who are bamboozled by unethical salesmen, beaten up, humiliated, and finally find their power and path, unleashing a new power never before seen. The old generation begs to learn from the new (the Beast begging at the hero's feet after feeling the ultimate attack of the Buddhist Palm). Romance is consummated at new maturity is found, and the next generation begins to learn in the same way as the old.
I think this is a remarkably optimistic outlook about human nature. Yes, one can find a message from a comedy kung fu movie. It says that the young will of course make their share of mistakes, but in the end they will surpass their elders, and the cycle will begin again.
Let's hope it's true.