Was that I was teamed up with Neil Finn to write the new New Zealand national anthem. We were getting on like a house on fire during the setting up of the instruments and tuning, and even the first few chords of the new anthem went fine until he suddenly said 'change to Z'.
I tried to fake knowledge of chord Z by mashing my hands across random strings and hoping he didn't notice, but he stopped dead and yelled 'You don't know the chord of Z?' You're the most ignorant musician in all history!' and I walked out with my head down while he glared at me.
It was the most conceptually perfect dream I've ever had, and provided me with an appropriate inscription for my headstone 'The most ignorant musician in all history'.