From Oscar Wilde's 1898 play, The Importance of Being Earnest:
Algernon. Oh! . . . by the way, Lane, I see from your book that on Thursday night, when Lord Shoreman and Mr. Worthing were dining with me, eight bottles of champagne are entered as having been consumed.
Lane. Yes, sir; eight bottles and a pint.
Algernon. Why is it that at a bachelor’s establishment the servants invariably drink the champagne? I ask merely for information.
Lane. I attribute it to the superior quality of the wine, sir. I have often observed that in married households the champagne is rarely of a first-rate brand.
-- SO. This Algernon is a batchelor (a man who is not married but is living on his own). When Algernon asks why the servants prefer to drink champagne over wine, Lane answers that wine is better than champagne, which makes it more suitable for servants. But why, in the last sentence, Lane says that "in married households champagne is rarely of first-rate brand"?
This makes absolutely no sense to me. Help?
EDIT: I didn't understand that they were talking about the same thing (champagne, which Lane refers to as "the wine").