3. Realized in the shower: all musical and lyrical qualities aside, I think what makes Frank Loesser's "I'll Know (When My Love Comes Along)" such an immortal duet for me is that both Sarah and Sky have no idea what they're talking about. It's easier to laugh at Sarah as she lists the required traits of her "Scarsdale Galahad—the breakfast-eating, Brooks Brothers type," knowing as we the audience do that she'll end up with no such person, but Sky's chemistry-based philosophy is equally faulty; he's looking at the love of his life right now and all he knows is that Nathan Detroit really sucker-punched him with this bet. It's an unwitting love duet. They just think it's a difference of opinion.

I've always associated Sarah's part of this duet with My White Knight from The Music Man, which has a lot of the same sentiment, except that Harold Hill doesn't have a part in the song to refute Marian's vision. I sometimes think that Sarah and Marian would get on, or possibly go to therapy together, after they both discover that they've fallen madly for incurable rogues and that they aren't actually all that unhappy about it.