Place it at the end of a setup, right after the bad suggestion, then follow it with a buzzer for a wrong answer or a bruh for disbelief, keeping the rejection as the final word in the sequence.
關於此聲音
This 1.3-second Dutch voice clip has Ronald Groot Jebbink saying Nee, denk 't niet!, meaning No, I don't think so, in a calm, flat voice with a brief pause before the last words. It feels dryly funny and completely final, like a door closing on a suggestion without any argument. The recording is credited to Jebbink in its audio tags and spread as a meme sound for Dutch rejections.