(HBO)

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Did. that. just. happen?! Sunday night's penultimate episode of Game of Thrones' delivered a shocking twist that left non-book readers reeling and managed to traumatize people who knew what was coming all over again. HBO better start providing group Game of Thrones therapy sessions, because after Sunday night's episode a whole lot of people are going to need them.We all knew Walder Frey was a creepy old man who could sire an entire army's worth of dowdy children. But we didn't know that he could commit the most insane double-cross in the series so far, luring Robb Stark and the rest of the Northerners to their deaths with the promise of a booze-filled wedding. As the band abruptly started playing the somber Lannister tune "The Rains of Castamere," you didn't have to be Catelyn Stark to know that something very, very bad was coming. A whole bunch of crossbows, some stabbing to the pregnant belly, and multiple throat slits later, Robb, his wife Talisa, Catelyn, and pretty much everyone else from the North was lying dead in a giant pool of blood at old man Frey's feet. Oh. em. gee.Twitter reactions to the long-awaited Red Wedding were nothing short of epic, with fans expressing shock, outrage, and other signs of serious TV PTSD. Check out some of the best tweets about the game-changing episode below, then hit the comments with your own thoughts: