Place it immediately after the bad idea is spoken, then follow it with the Wrong Answer Game Show sting to mark the idea as rejected, and keep No No Wait Wait for the moment someone tries to argue back.
About this sound
This 2.5-second vocal clip repeats the German word nein three times, turning a simple no into a complete refusal. It feels blunt and exasperated, with a comic finality that makes the rejection itself the joke. Nothing in it invites a reply, so the refusal stands on its own.