Place it immediately after the bad suggestion in your edit, then follow it with a Ba Dum Tss sting to underline the rejection. For a failed plan, put Mission Failed before it to set up the flop, then let this clip deliver the verdict.
Über diesen Sound
This one-second clip features Donald Trump delivering the line 'I Don't Think So!' in a firm, dismissive voice. The delivery feels blunt and final, like a door closing on a bad idea, which makes it funny as an instant shutdown. It works as a quick, confident refusal that needs no further explanation.