The phrase tra loi khong dung is everyday Vietnamese for an incorrect answer, which is why the clip travels easily as a reaction sound on short video platforms and soundboards. It does not rely on a specific show or character to make sense, so editors reuse it wherever a wrong guess needs a clear label. Its popularity comes from that directness, plus the short length that fits reaction cuts, memes and classroom or quiz edits without re-recording a voice line in Vietnamese each time a mistake happens on screen for viewers.