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MP3をダウンロード 
Put it right after the doubtful claim as the cutaway reaction, then follow it with the wrong answer sting when the lie falls apart, or let the sad violin carry the aftermath if the speaker doubles down.
このサウンドについて
This is a very short voice clip, lasting under a second, of someone saying yeah, sure, uh in a flat, drawn-out way, with the hesitation landing after the agreement. It feels sarcastic and doubtful, like a polite brush-off for a claim nobody really believes, with a dry, awkward edge that makes the disbelief land harder than a straight no would.
