When you
forget something you did due to memory loss, or just because you
forget things often, and you blame it on your secretary (that you don't
really have) because you're trying to save face.
You
see a charge on your bank statement and you call the company and yell at the
phone operator and ask how they debited your account and they inform you that a debit could not have been made except by ME, and then you realize you were the
one who debited your card but had forgotten so you tell the operator that it 'must've been debited by your secretary'