The phrase but I'm not done has become a reusable reaction line online because it captures a very familiar feeling in under two seconds. Creators lift the clip on its own and drop it into unrelated footage, letting the speaker argue with the edit itself. It works especially well in short form video where a joke, explanation or challenge seems finished, then continues anyway. Its popularity comes from timing rather than context, so viewers understand the stubborn protest instantly even without knowing where the recording first came from.