how to ruin things for yourself

I clicked on a three-minute video on YouTube that purported to be a quick discussion of "Game of Thrones"—specifically, how to end the series and whether to change the story if fans had managed to guess certain plot points. It sort-of was such a discussion, but at the very end, the video ambushed me with a spoiler from Season 8 that was arguably the crowning moment of Episode 3's Battle of Winterfell. So now I know how the Night King gets his. Dammit.