No widely documented origin is attached to this short clip, so it is best understood as a piece of online soundboard culture rather than a line from a named film, show or song. Short farewell clips travel well because they are instantly recognisable, easy to place at the end of a video and useful across languages, and Tschau carries that same friendly, informal energy. On soundboards and in edits it survives as a compact sign-off, reused whenever a creator wants a light, memorable ending without explaining the joke.