Emergency alert tones are designed to be impossible to ignore, and Australian versions share the same piercing, repetitive pattern used for bushfire, flood and severe storm warnings. Online, the sound has been lifted from that serious context and reused as a joke, especially in prank and meme videos where an ordinary moment is treated like a national emergency. Its recognisability is the point: viewers hear an official warning and expect danger, so the contrast with a silly clip makes the punchline land harder.