Place this clip right after the finished result appears on screen, not during the build itself. Lead into it with the huh reaction for the first beat of confusion, then let this line carry the admission before you cut to your next attempt.
O tym dźwięku
It is a brief spoken clip, just under two seconds, of a voice saying the Russian phrase Kak Ya Tam Delal in a puzzled, retracing-my-steps tone. It gives a listener that blank, slightly embarrassed feeling of trying to remember exactly how you did something you cannot quite reconstruct.