Luchtalarm is the Dutch public warning siren used to alert people during serious emergencies, and it is widely recognized in the Netherlands from regular nationwide siren tests. Online, the sound spread beyond its real-world purpose because its urgent sweep instantly signals danger, panic or exaggerated drama. Creators use it in meme edits, prank clips and fake breaking-news moments where an ordinary situation is treated like a full-scale crisis. Its familiarity and unmistakable tone keep it popular in short-form videos and soundboards.