"Twenty Years" is a short story by O. Henry, known for its twist endings and exploration of human relationships. The narrative follows two friends, Jimmy and Bobby, who reunite after two decades apart. They reminisce about their past and the choices that led them to their current lives. As the story unfolds, it becomes clear that both men have changed significantly. The twist reveals that they are actually on opposite sides of the law, with Jimmy being a criminal and Bobby a law enforcement officer. This unexpected turn highlights themes of friendship, loyalty, and the impact of time on personal identity.