This sound is associated with the classic Looney Tunes closing line, 'That's all, folks,' a signature ending used in Warner Bros. animated shorts. Over time, the phrase became bigger than the end card itself and spread through remix culture, meme edits and reaction videos. People still use it because the meaning is immediate: the bit is over. Its mix of vintage cartoon nostalgia and clear comedic timing keeps it relevant in modern short-form video.