Littlefinger being self-serving is not a spoiler. Everyone is self-serving. I just didn't know this guy was basically evil, maybe even maniacal. At first, I thought he was loyal to the Lannisters, but now we know his intention is to bring chaos.

It's unfortunate, those will knowledge of spoilers can't completely hide it from their posts. It's like watching a movie with someone who's already seen it. If that person talks about the plot or character development, we can pretty much infer that what he said is at the least partly true. For example, I'm sad to have found out that Sansa and Lady Catelyn will not be doing anything useful for the rest of the series. Of course, I would have been disappointed about them either way. But at least there would have been some suspense.

All I'm asking is that book readers be a bit more mindful of non-book readers.

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Btw, what was Lady Olenna referring to when she said "Rarely do you meet a man who lives up to his reputation?"