Well that's sad has circulated online as a short reaction phrase rather than a clip tied to one famous scene, which is why it works in so many different edits. Creators use the line as shorthand for fake sympathy, dropping it after fails, bad luck, and underwhelming reveals to signal that the disappointment is not actually serious. Its short length and instantly readable tone have kept it useful for memes, reaction videos, and short-form edits, where a single dry line can close a joke without needing extra context.