In my fraternity we had many alumni being Lutheran ministers, and one of them was well rounded and bald. A brother often played the organ during his services. One day he told us to come to the service next sunday because he had a surprise for us. When the minister climbed the scales to the pulpit, our brother started a fugue. When the minster's bald head appeared, we recognized the theme: the old song "der Mond ist aufgegangen" - the moon arises.