Place this clip at the reveal in a prank edit, after a Dramatic Dun Dun Dun for tension and just before a Vine Boom Sound Effect for the final reaction. Follow it with a Door Knocking Sound Effect if the joke continues into someone answering the door.
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This is an eight-second Austrian police siren with a sharp, urgent rise-and-fall tone that sounds like a patrol car closing in. It creates instant tension and a jolt of surprise, turning an ordinary moment into a getting-caught joke. Shared online under the label Polizei Österreich, it is used as a recognisable police effect rather than a line from a film or show.