The sound comes from E3, the major video game industry showcase where publishers and developers present new games to a live audience and online viewers. Short reaction moments from those presentations are often clipped and shared on their own, because they capture the excitement, hype, and occasional absurdity of a big reveal. This brief incredible reaction has survived in that form, passed around in gaming edits and reaction videos as a shorthand for impressed disbelief, and it still works because it is short, instantly readable, and easy to drop over almost any surprising moment.