I was taught to complete the debrief and then bring up the 'fail' bit at the end, not the beginning. The logic was that if you mention 'failed' at the beginning you won't have their attention for anything else you say afterwards.
Announcing 'Fail' Polish Air Force Style:
QFI: What does your mother call you Higgins?
HIGGINS: John, Sir!
QFI: Well John, you're f*****g chopped!