"But what do you do then? Do you change it and come with something goofy and outlandish that you haven’t led the…? haven’t done the foreshadowing for…? that you haven’t laid the foundation for…? just in order to surprise people…?
I mean, sure I could have aliens come down, and that would certainly surprise the hell out of everybody. No one has predicted that, but it would ruin the series…”
~George RR Martin, 6 Aug 2011