Place this clip right after the questionable claim in your edit, before your response takes over. Follow it with the Huh sound for a second layer of confusion, or precede it with Sudden Suspense when the claim needs a build before the reaction lands.
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This is a short voice clip, about two seconds long, built around a single incredulous 'really' delivered as a question. It captures that split second of disbelief when something sounds unlikely or exaggerated, and the feeling it gives is amused skepticism rather than anger, like a friend pausing to check whether you actually mean what you just said.