Its not as easy to find examples when you're looking for them
Here's one I found while walking around. Of course the ones that matter most are not incidental dialogs like this, its just an example.
Kaimi, one of the New Order soldiers standing around listening to Aquila in front of the Lanilor Lane shrine says something when interacted with. Close your eyes so you can't see the subtitles and see if you have any idea at all what she says for the second half of each of her two lines. This one is a little tougher because Aquila won't shut up.
Another one, after you have completed Sinister Motives by giving all 3 jewelry pieces to Astridax you can ask him why he needed the ghosts. One of his lines is "Suffice it to say in the long run it will assuage the vexatious road to absolute preponderance in the dark arts over all corrivals."
Now I understand that he's not supposed to be easy to understand, but he's not easy to even hear. This is a dialog you have only one chance to hear, it comes after the rewards are collected (at least it did for me). But you can spend as long as you want to read it before clicking for the next line.
