This running sound comes from the Pluto cartoon T-Bone for Two, released in 1942, where Pluto's frantic scampering was given a squeaky, exaggerated cartoon treatment. The effect later circulated as a classic Hollywood cartoon footstep sound, appearing in sound libraries and edits that reuse vintage animation audio for comic movement. Because the rhythm is so instantly recognisable as hurried cartoon running, creators still reach for it for chases, escapes and slapstick timing, even when the original cartoon is not on screen.