Put it at the very end of the setup, once the doomed plan is fully clear, then follow it with the wrong answer buzzer for a game-show verdict or Nelson's laugh for extra mockery.
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A single Brazilian Portuguese speaker says “Não vai dar não” in a matter-of-fact, unimpressed voice, finishing the whole refusal in less than a second. The repeated negative makes it sound stubborn and final, mixing refusal, scepticism and light teasing. It circulates in Brazilian meme edits, gaming clips and chat audio, where one blunt line can reject a plan outright.