Let's just say Sansa/Bran and Arya against LittleF*ker was long awaited.
I knew Sansa was playing him with the long con. I kept saying it, that her and Arya's tension was false. Some of the clues were;
1. Sansa saying only a fool would trust LittleF*ker and Brienne (Sansa's protector) being forthcoming about her disdain for him.
2. Sansa asking where did Arya get the note when she knew only Baelish was present with her and the Lannisters when she wrote it. Maester Luwin and Robb were dead.
3. How could she forget that he sold her to the Boltons, he being the one person in Westeros who knew everything about everyone.
4. And what sealed it was Arya saying she wonder how it would be to wear Sansa's pretty dresses and be the Lady of WinterFell when we know she doesn't want that at all. (She was playing the game of faces).
Gosh that was the best moment for me!
The second best thing was seeing Cersei's face when ...
Azor Ahai is a legendary figure in the faith of R'hllor, the Lord of Light. Thousands of years ago, he forged the sword Lightbringer which he used to defeat the darkness of the Great Other. This came at a price, however, as in order to unleash the sword's true powers he had to plunge it into the heart of his loving wife, Nissa Nissa. A prophecy foretells that he will be reborn as The Prince That Was Promised.
You can read more about this prophecy here: http://gameofthrones.wikia.com/wiki/Azor_Ahai
There are a bunch of candidates/theories around who could be Azor Ahai. Here's a related discussion on Commonlounge: Rhaegar is Azor Ahai. Jon Snow is Lightbringer aka The Prince That Was Promised (Theory)