Place it right after your reveal shot, preceded by a sudden suspense sting to build the bad news, then follow it with the no no wait wait plea if the refusal needs a second beat before the cutaway.
Über diesen Sound
This is a six-second clip of a high, childlike voice chanting 'no no no' over and over in quick, stubborn protest. It sounds less like a calm refusal and more like full panic at a bad suggestion. The feeling is funny and frantic, the vocal equivalent of waving both hands and backing away fast.