In the movie Finding Nemo produced by Walt disney studios. The father clown fish is marlin and he begins his journey to find his son, Nemo. One day while they were on a field trip, Nemo swam over the abyss and got kidnapped by a scuba diver. Marlin witnessed his son’s abduction and immediately goes on a quest to find him. The theme could be never give up.
One reason that the theme could be never give up because. In the movie there were several times where marlin thought he wasn't going to make it. But he persevered through many obstacles such a pack of sharks a field of jellyfish being swallowed by a whale and many more but he still found a way to find nemo and make it back home safely.
Another example could be