Scooby-Doo first appeared in 1969 in the Hanna-Barbera series Scooby-Doo, Where Are You!, where the cowardly Great Dane became famous for his speech patterns, snack obsession and comical reactions. His distinctive laugh, originally performed by Don Messick, became part of the character's identity across decades of reruns, films and new series. As clips moved online, the laugh was lifted for soundboards, reaction videos and memes, where it still works as instant shorthand for goofy, lighthearted comedy rooted in childhood nostalgia.