Urban Ag said:
From the Bran meme on the humor thread.........of all the things Brand could have told Sansa when they were talking beneath the Weirwood, he told her something to the effect of "you looked beautiful in your white dress at your wedding".
Ok, that was almost in the creeper zone for her brother to say that and also of course because if was probably the worst day of her life. And if Bran could see her at her wedding surely he also saw what a psycho Ramsay was. So was the point of this just to tell her something very specific to make her believe he is the Three Eyed Raven?
Certainly that was the intent: for Bran to "prove" his ability to his sister to gain her understanding and belief in him.
It was just a creeper scenario. Howabout: "I saw Aunt Lysa threaten you and Lord Baelish push her out the moon door. I am sorry you had to deal with that... and Joffrey made you look at Fathers head on the spike... horrible"
Same point is made but much less creeper.