Fire truck sirens have long been used in soundboards as a shorthand for an emergency, thanks to their distinctive two tone and wailing patterns that vary by country. In the Netherlands and Belgium the fire service is known as the brandweer, which is why this clip is often tagged and searched in Dutch as well as English. Short siren clips like this spread through meme pages and messaging chats, where a few seconds is enough to set a scene, imitate a passing truck, or signal that something has gone wrong.