Scooby Doo first appeared in Scooby-Doo, Where Are You!, the Hanna-Barbera cartoon that premiered in 1969, following Scooby, Shaggy, Velma, Daphne and Fred as they solved mysteries. Scooby's distinctive laugh became one of the show's signature sounds, instantly tied to his cowardly but lovable personality. As clips from the classic series circulated online, the laugh was lifted for memes, reaction videos and short-form edits, where it signals silliness or nervous relief. Its longevity comes from that instant recognition, letting creators borrow decades of cartoon nostalgia in just a few seconds.