Mermaid

Plot: A boy found a tiny fish and it suddenly turned into a mermaid. He brought the mermaid home and showed it to his parents, whereas all they could see was just a normal fish. The boy was than caught and tortured, eventually the image of the mermaid faded from his mind. He brought the fish to the beach and walked into the ocean. Once again the fish turned into a mermaid. 

End: Everyone saw the mermaid while the boy walked into the ocean, but they just stood and watched. The boy chose his mermaid over that rigid society. Those adults sticked to what they believed even if the mermaid just appeared in front of their eyes. 

Message: All people should have the freedom of thought. The adults grown up in that country lost the ability to tolerant imaginations showed people's belief can be easily shaped by what they see and told.