About 'Lady Stoneheart' (big spoilers, again)
Spoiler:
So Catelyn is dead, but in the books, she is not actually gone! She becomes Lady Stoneheart! Who has deep gashes in her face from scratching herself, can’t speak because her throat was cut so deeply, and was in the river for a few days before being brought back to life. She marauds around killing Freys, plus anyone who might have done the Starks wrong, and appears occasionally going forward. Have you talked to Dan and David about Season 4?
MF: Well, you’ll just have to keep watching. You’ll have to keep wattttttcccchhhhin’.
The way Lady Stoneheart, zombie Catelyn, is described — she’s completely insane, basically.
MF: I’m completely insane, so it mightn’t be too much of an acting stretch!
Were that to happen in the show’s future, would that be fun?
MF: No one knows, no one knows. Sorry, Kate!