“Hayai” is a common Japanese word meaning fast or early, so this clip is usually recognized through anime usage rather than one single universal source. Online, it spread as a short reaction sound in anime edits, gaming montages, and meme clips where someone moves unexpectedly quickly. Its popularity comes from how cleanly it communicates speed in just over a second. Creators still use it because it is easy to drop over fast cuts, chase scenes, and exaggerated action moments.