The AMBER Alert system was created in Texas in 1996 after the abduction of nine-year-old Amber Hagerman, and it later became a nationwide network for rapidly sharing information about missing children. Its distinctive emergency tone is now familiar from mobile phones, television and radio, where it signals an urgent public warning. Online, creators stripped that familiar alarm from its serious context and began using it as a prank cue, because almost everyone recognises it instantly and reacts before thinking. That instant recognition is why the short clip continues to circulate in memes and reaction videos.