Ninjet alert sounds circulate online as generic notification effects rather than as a clip tied to a confirmed film or show, and this second variant is shared on soundboards for quick reuse. Creators treat it like a Discord Notification cue, dropping it into streams, chats and edited videos whenever a message needs to stand out. Its popularity comes from instant recognition, since phone and app alerts are sounds people check reflexively every day. That familiarity keeps it useful for memes, pranks and reaction edits long after the original upload.