You turn to Giles and say, "See, I was on my way here and I took a wrong turn, and I got lost and didn't know where I was, and by the time I found my way back--" Giles stops you in mid-sentence and says to you, "I'm afraid I don't believe that for even a moment." Well, you've run out of excuses.  Guess it's time to... ...Confess the truth.