Place it as the reply line right after the bad suggestion in your edit, then follow with a wrong answer game show sting for a bigger fail, or precede it with no no wait wait when the plan is still unfolding.
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A five-second voice clip of someone answering with a drawn-out yeah followed by a firm no, the two words doing all the work. It feels blunt, dry and quietly funny, like agreement that instantly flips into refusal, which makes the delivery land as a deadpan shutdown rather than a serious argument or angry rejection.