Place it at the peak of a reaction edit, just after the reveal, then follow it with Bruh to underline the joke, or open with Oh My God Meme and let this clip answer it for a second reaction.
关于此声音
This six-second clip is PewDiePie stretching a single wow into a long, rising exclamation, with his voice carrying the whole joke. It feels gleefully over the top, like amazement pushed past the point of believable, and it lands best as a knowing reaction to something absurd or impressive.