Some of the background conversations in Witcher 3 are quite clever. Some of the foreground ones as well.
You're gonna make me do the "BLOTA HIMMEL" thing again aren't you
Y'know, funny thing, I honestly had no clue what you were going on about before. I hadn't even made it to Skellige yet, although I had already heard about the mysterious and exotic regions of "Faroe", "Larvik", and "Lofoten"... I've been taking an extremely ponderous route through the game thus far.
Anyways, it's more just walking around on your way to some quest or another and getting caught off-guard by random snippets, such as...
Beggar 1: "I trusted a woman once... Would've given my right hand for her."
Beggar 2: "What happened?"
Beggar 1: "I don't fuckin' have my right hand no more, that's what happened."
Or a little Python reference from a particular ex-leper bemoaning the loss of his profitable career thanks to an overly philanthropic healer...
What prompted me to make a post singing the writing's praises was this small exchange between a strumpet and her patron...
Man: "Now, eh, the war's been rough on all of us, so... Give us a go for half-price?"
Lady: "Hmph. Half price means I only take half o' me clothes off. But, you're a regular, so you get to choose which half..."
Man: "In that case, I choose the front!"
As for more interactive conversations, there are the trolls. The trolls are amazing. I wouldn't be able to do them justice by transcribing their thinky thoughts here... It makes me sad to kill their rabid cousins out in the wilderness, but such is life in these desperate times.