Place it immediately after the clever moment in a clip, before the reveal of the basic mistake, then follow it with Wrong Answer Game Show for the failed answer and Nelson's Ha-Ha for the group reaction, keeping the sequence short so the contrast stays clear.
Über diesen Sound
This is a short male voice reaction clip lasting just over three seconds, built around the idea of an idiot savant: someone brilliant in one narrow area and lost everywhere else. It lands as a dry, teasing put-down, funny because the judgement feels knowing and specific to that one blind spot.