Book Spoilers (also, I'm now up to episode 8. Woo, caught up! )
SpoilerRobb scenes make me too sad. I'm not sure I'll be able to watch much more of this without shedding manly tears for the heresy still to come.
That said ~
"A green boy, he'll run back to Winterfell with his tail between his legs at the first taste of battle"
Even Tywin Lannister couldn't have predicted that he'd need to have Robb murdered, for fear the Young Wolf would win the war (and he almost did, too ). Bloody coward lion, at least the North has honourable victories, not Red Weddings.