Place it immediately after the reveal of what went wrong, before any reaction shot, then follow it with the sad violin for a mock-tragic beat or a cartoon slip if the fail was physical, keeping the admission as the centre of the sequence.
Über diesen Sound
This is a short German spoken line, lasting about three and a half seconds, in which the speaker calmly states that things happened and mistakes were made. It feels resigned and wry, like a deadpan shrug after something has already gone wrong, turning an awkward admission into a joke without sounding panicked or angry.