There is no single famous film, show or viral video clearly behind this short ba la ba la clip, so it works best as a generic piece of internet babble rather than a quote from a known character. Similar nonsense-syllable sounds have long been used in comedy and animation to suggest talking without words, and short clips like this one circulate on soundboards because they are instantly understood across languages. Its one-second length keeps it useful for quick reaction edits, prank calls and meme captions where a longer line would slow the joke down.