Muttley first appeared in 1968 as the snickering canine sidekick to Dick Dastardly in Hanna-Barbera's Wacky Races, voiced by Don Messick, and later starred alongside him in Dastardly and Muttley in Their Flying Machines. His wheezy laugh became his trademark, signalling that a scheme was either underway or had just gone wrong. Decades of television reruns kept the character familiar, and short clips of the laugh later spread through memes, reaction videos and edits, where it still works as instant shorthand for sly, villainous amusement.
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The wheezy, snickering laugh of Muttley, Dick Dastardly's dog from Wacky Races, used in memes and edits to mock a failed plan or a sneaky win.
Muttley's laugh is a short, raspy, wheezing snicker that rises and falls in quick, breathy bursts, instantly recognisable even without any picture. It is the sound of a scheming cartoon dog enjoying someone else's misfortune, sly and mischievous rather than warm or friendly. Heard on its own, it makes a moment feel cheeky and underhanded, as if the joke is on the person on screen. That is why editors drop it over a failed scheme, a sneaky trick, or a villain quietly celebrating, because the laugh alone tells the audience exactly what kind of character they are dealing with.