Place it right after the mistake is shown, then follow it with a Wrong Answer Game Show sting to underline the miss, or let Nelson's Ha-Ha follow for a group laugh. Keep it as the single reaction beat in an edit, with the reveal before it and the laugh after it.
Über diesen Sound
This is a short reaction clip, about five seconds long, built around a voice asking 'Are you blind?' in a tone of disbelief. It lands as a blunt, funny call-out for the moment someone overlooks something obvious, with an exasperated edge that makes the question feel sharper than a simple remark. It works best as a quick, pointed reaction rather than a longer line.