Almost. A man wanted to do Gustav Mahler as his specialist subject. So the BBC contacted the Mahler Appreciation Society and asked them if they could recommend a Mahler expert who could set the questions. They said yes and recommended ..... the prospective contestant! He was honest enough to...
Blimey, fair play. I'm 'not bad' at quizzes (speaking as one of your occasional colleagues in Lush's all-conquering 'Magnificent Seven' REMF quiz team!), and have occasionally thought of doing Mastermind, but always chickened out.
Yes, I'd like to say something like the Tang Dynasty of China 618 to 907AD, but I'd probably go for the 'Molesworth' books by Ronald Searle and Geoffrey Willans.