Well - clearly not so well known since 1 out of the 3 ToC finalists didn't get it. I thought it was a great clue requiring both figuring out the context quickly (which I thought was the easier part) and then having to pull out the name of the play. It's not as if this is a play that is still part of modern theater production schedule . . . Pretty much all final jeopardy clues require you to know a specific piece of knowledge - not an in depth knowledge of the category. I'd suspect the people who knew that answer from a theater chat group is going to be significantly higher than the general population because we do in fact have a knowledge of plays.