PewDiePie, the online name of Swedish creator Felix Kjellberg, built a huge audience with energetic Let's Play videos and reaction-driven humour, where exaggerated surprise became a trademark of his style. Short vocal reactions like this wow were clipped, shared and reused across meme pages, reaction videos and soundboards, long after the original streams had passed. Its appeal is its immediacy: a single familiar voice can signal disbelief, excitement or irony in seconds, keeping it useful for editors who want a fast, recognisable reaction without explaining the joke.