Place it at the end of a setup clip, right where the bad idea is revealed, then follow it with a Vine Boom for a heavier punch or a SpongeBob Fail when the idea collapses completely. Put an Anime Wow before it if you want the request to look even more unbelievable first.
Über diesen Sound
This short voice clip lasts about two and a half seconds and pairs a bright, teasing laugh with a firm spoken no. The laugh lands first, making the refusal feel playful rather than serious, then the single word cuts it off with comic finality. It feels mocking, lighthearted and deliberately over the top, like turning down a ridiculous suggestion with a grin instead of an argument.