Place it straight after the surprising claim in your edit, then follow it with Oh My God Wow to extend the reaction, and close the sequence with Damn Meme Sound for a final beat.
Über diesen Sound
A clipped vocal outburst lasting about two and a half seconds, built around a stuttered first syllable that trips into a single sharp word. It lands as a burst of bewildered disbelief, the kind of sound that makes a wild claim or an unexpected reveal feel even more unbelievable, and it works best when the reaction needs to feel immediate and unfiltered.