Kruitvat is a well known Dutch drugstore chain, but this particular clip has no confirmed official source and circulates mainly as a user uploaded soundboard item under the name Kruitvat really low sound. Its appeal is not a recognisable slogan or melody, but the joke in the title itself, which promises something so quiet that listeners have to strain to hear it. Shared in meme edits and group chats, it survives because that simple low volume gag translates instantly, even for viewers who have never heard of the store.