In my History of Theatre class, the professor remarked about a movie we were going to watch featuring Marlon Brando. He asked, "Anybody know who Marlon Brando is?" I raised my hand, expecting to be one of many in the class. Turns out I was one of one. Nobody in the class knew who one of the greatest actors in the history of cinema was.
In stunned disbelief, I had to remark aloud, "Do any of you know who Beethoven is?" I felt sure this could not be an incident of pure agism, as Brando was not a recent contemporary film star. I though if anyone knew who Beethoven was, it would make the point since Beethoven had died in March of 1827 in Vienna. I expected everyone to know who Beethoven was, and indeed everyone raised their hand.
"Of course we know who Beethoven is," replied one of my peers. "I've seen all seven of his movies."