Place it right after the confused look in your edit, then follow it with Bruh for a flat reaction, and bring in the fail sound only when the plan falls apart completely.
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Lego Mente is a short clip of about four seconds built around an empty mind, presenting a blank mental space with no thought, plan or reaction to follow. It gives a listener a bemused, slightly comic pause, the feeling of a head with nothing going on inside it. That simple blankness makes it easy to recognise and easy to reuse whenever a moment calls for total mental emptiness.