Two brothers were being entertained by a rich friend. As ill luck would have it, the talk drifted away from ordinary topics.
Do you like Omar Khayyam? thoughtlessly asked the host, trying to make conversation. The elder brother plunged heroically into the breach.
Pretty well, he said, "but I prefer Chianti."
Nothing more was said on this subject until the brothers were on their way home.
Bill, said the younger brother, breaking a painful silence, "why can't you leave things that you don't understand to me? Omar Khayyam ain't a wine, you chump; it's a cheese."