Little reliable information is available about the original source of Frank Sub, and it is best understood as a short clip that has circulated through soundboard and meme-editing communities rather than as a scene from a widely documented film or show. People discover it by searching for its distinctive name and then reuse it in short videos, streams, and reaction edits where a brief, punchy interruption fits the joke. Its continued use comes from that simplicity: it is easy to recognise, easy to place, and it does not need context to work.