Because no specific show, film or creator is attached to this clip, it is best understood as a general online reaction sound rather than a quote from a known scene. Short filler reactions like this travel easily because they are instantly recognisable, easy to drop into a timeline and useful in almost any genre, from gaming and commentary to vlogs. Creators keep returning to it because a single confused word can signal disbelief faster than a caption, and it works even when viewers watch with sound off, as the facial reaction usually carries the same beat.