During the Battle of Hogwarts in Harry Potter and the Deathly Hallows: Part 2 after his run from the shattered footbridge, an adrenaline-struck Neville Longbottom runs up the stairs where he meets Harry:
Harry: Neville, you're alright?
Neville: Never better! I feel like I could spit fire. You haven't seen Luna, have you?...I'm mad for her! I think it's about time I told her since we'll probably both be dead by dawn!
Which always came totally out of nothing for me, as I hadn't picked up any vibes suggesting this before.1 Now I see that the movies probably can't take as much time for all those side characters, especially since Luna wasn't introduced before the Order of the Phoenix at all, I think. But is there any chance that Neville's feelings for Luna have indeed been foreshadowed earlier in any of the movies and I just missed it or was that really such a surprise for everyone. Or maybe it even was a total surprise at this point in the book, too (if the movie was even true to it in this regard)?
1) I even remember both of them standing as a couple at the train station at the end, which seemed a bit too forced to me (well that whole ending did, but nevermind). But after rechecking I can't find them and might have just imagined this.