The phrase itself is a common internet reaction, stretched for comic effect rather than tied to one famous scene or character, which is why it works in so many different videos. Short reaction sounds like this spread through meme pages, gaming streams and short-form video, where a single exaggerated outburst can carry a whole joke. Creators reuse it because it is instantly recognisable, easy to drop over almost any surprising moment, and short enough to loop or cut without losing its impact, keeping it in regular use for fails, reveals and unexpected twists.