Place it right after the unbelievable claim in your edit, then follow it with the Oh My God Wow sound for a bigger reaction, or put the Ceeday Huh sound just before it to build the doubt in two steps.
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This very short voice clip, under a second long, captures a young Japanese girl saying “ehe” in a rising, questioning tone, as if asking “like really?” It lands as playful disbelief, light and a little teasing rather than angry, the kind of quick reaction that makes a doubtful moment feel cute and funny instead of confrontational.