My absolute favorite scenes happened in Robert Jordan's last book in Knife of Dreams.
The chemistry between Mat and Tuon were just perfect. I think my absolute favorite was in the latter half of chapter 25 Attending Elaida and Mat let a poisonous snake go and quite suddenly Tuon told Mat that he has permission to kiss her and well I don't think I laughed so much and just be happy from any scene. Also close second was when Tuon suddenly completed the marriage ritual with Mat in the middle of Under an Oak.
Oh I so miss RJ's Mat and Tuon.