The sound is based on the United States Emergency Alert System, the nationwide public warning system that replaced the older Emergency Broadcast System in 1997. Online, the EAS tone spread through parody alert videos, creepypasta style broadcasts, YouTube edits, and short-form meme clips that mimic emergency interruptions. It remains popular because the sound is instantly recognizable to many American viewers and communicates urgency within a second, making it useful for both horror style edits and exaggerated joke setups.