Answer:
When I was younger, I had a classmate who was always quiet and kept to himself. I never really talked to him and always assumed he was just a shy person. But one day, during a group project, I ended up being in the same group as him and was surprised to learn that he was actually really funny and outgoing. I realized then that I had held a single story in my head about him, thinking he was just a quiet and shy person, when in reality, he was much more than that. It taught me the importance of getting to know people and not judging them based on assumptions or stereotypes.