The fast forward and rewind scrub comes from analogue tape and VHS players, where moving tape quickly across the heads produced a sped-up, distorted version of the original audio. Editors kept the noise after digital video replaced tape because audiences had already learned what it meant. Online, it survives as a shared shorthand in memes, gaming videos and short edits, signalling a skip, a search or a do-over without any on-screen text or explanation needed.