I'm hoping to confirm (or receive corrections) on a guess I have about the meaning of a sentence.
I'm reading a manga, and Character A stares at Character B for a long time with a serious expression. Finally, she says:
Character A: ペプシコーラとコカ・コーラどっちがいいかな.
Character B: 何を言い出すかと思えば.
Character B's response leads me to believe that he's saying something like, "With a serious face like that, I had no idea what you were going to say." But I'm not sure if I'm correct. As far as I know, 言い出す means to "blurt something out", but the grammar here is confusing me. Would appreciate anyone being able to break this down for me, thank you!