I actually did laugh the other night at some of Astarion's responses during the dialogue about the best way to be killed. I'm not sure if that's new (I've only played on Patch 3 previously) or if I just missed it the first time, but it surprised a laugh out of me.
I appreciate games that don't take themselves completely seriously. A bit of ridiculous humour here and there can be fun, and I always appreciate characters with a sharp wit.
However, the thing that makes me smile the most in BG3 is seeing the dog wander by in the background, happily wagging his tail, when I'm in the middle of a serious conversation with a party member. Thank you for that, Larian. Even when the world seems like it's about to end, I still have my dog.