Its exact original source is not clearly documented, so it is best understood as a user-shared soundboard sound rather than a confirmed film or television line. Online, short robot-voice clips like this circulate because they are instantly recognisable, easy to reuse and short enough for memes, reaction videos and edits. The phrase and now you know works as a self-contained punchline, which helps it travel across different contexts without needing the original scene, keeping it useful long after its first uploads.