Teen Titans Go is a long-running Cartoon Network comedy about the young DC heroes, with Beast Boy as the green, shape-shifting member of the team. Sad moments featuring him are often lifted from the show and shared as short clips, where the sad song does most of the emotional work. On soundboards and in short-form edits, the sound has become shorthand for disappointment, loss or a plan falling apart. It stays useful because the tone is instantly recognisable without needing the full scene, so a few seconds can set the mood for a joke.