There were two types of people watching Game of Thrones last night. Those who had read the books, and knew what was coming. And those who had not, and inevitably lost their shit.
Without getting into spoiler territory, let's just say important things happened that, had you not been previously aware, might have come as a shock. Which probably explains why so many people around the world who had read the books got their cameras out and filmed the reactions of those who had not.
Laugh if you want, but I can sympathise. I knew what was coming and was still a little caught of guard, especially with what happens at the very start. You know. The bit that's not in the books but which ends very badly.
Game of Thrones: Red Wedding Reactions Compilation [YouTube]