The line comes from Pipkins, the British children's puppet series that aired on ITV during the 1970s, and it survives today purely as a piece of dialogue rather than a famous scene. Like many vintage children's TV quotes, it was lifted onto meme soundboards where its exaggerated politeness made it a handy reaction clip. It endures because the joke is timeless: treating an abrupt exit as a breach of etiquette. Short, quotable and theatrical, it fits anywhere a creator wants a prim, old-fashioned scolding.