The sound comes from Scooby-Doo, the talking Great Dane from the long-running Scooby-Doo animated franchise that began in 1969 with Scooby-Doo, Where Are You! His laugh became one of the character’s most recognizable vocal bits across television reruns, compilations, and online meme edits. It still gets used because the laugh is instantly familiar, family-friendly, and easy to drop into funny moments that need a playful reaction instead of a harsh sound like a bruh.