Warning: This article contains MAJOR BOOK SPOILERS. Click away now if you don't want to know!
In the book, “The Rains of Castamere” is the Lannister fight song which signals the start of The Red Wedding, where Edmure Tully and Walder Frey’s daughter have a marriage ceremony that turns into a bloodbath.
We’ve already seen Edmure Tully accept his marriage arrangement to Walder Frey’s daughter in episode six, and we know Frey wants to see this wedding ASAP, so all signs point to bad times ahead for the Starks and their rebellion. Anyone who has Robb Stark in their GoT office pool should change their ballot NOW!
Catch the next episode of Game of Thrones on Sunday, May 12 at 9 p.m. ET/PT on HBO.