The title 'キュキュキュイン' is a Japanese onomatopoeia rather than a quote from a known show, film or game, so the clip circulates as a free-floating sound effect with no confirmed original scene. Onomatopoeia like this travel well because they describe a feeling instead of a reference, which is why uploaders tag the file with its romanised reading, kiyukiyukiyuin, so searchers can find it. Short squeak effects like this one are staples of meme edits and anime-style reaction videos, where a three-second sting can sell a gag without any dialogue.