Many stories feature a principal cast that is primarily made of children or teenagers, and many such series therefore spend a good amount of time with these characters in school. When these stories end, it's common to send the cast off in a grand fashion by having them graduate from their present school level. As the big day approaches, characters meet to talk about where they're going next, reminisce about the good times together (such finales are often part Clip Show, allowing the audience to relive those moments), or just have one last great bash before they graduate and all (or some) go their separate ways. These are especially poignant when the characters are in High School, as it adds an extra layer of the cast passing into adulthood and really starting their lives on their own.