SO I noticed something interesting in the scene where Tyrion sends Shae away (finally, good lord....). On the left of the shot is white, and it has a sort of gradient to black moving to the right. Is this foreshadowing Tyrion's story? Such a shot seemed very purposeful. It was striking and we got to see Tyrion contemplating what he was about to do. Or perhaps it was just meant to reflect his conflict about it. But I think they conveyed that through the use of that shaky cam that seems to be everywhere now. So is this a hint at where he is going? He already seems so much less happy than he did in the beginning of the show. The life was sucked right out of him after the battle at King's Landing.
Some shaky evidence for this could be that if you view Tyrion's story on a timeline, it matches up with his mood.
Light---------------->Dark
Season 1 was Tyrion at his lightest, and brightest. He was funny, he was full of life, and seemed to have a certain confidence in who he was. "Never forget what you are. The rest of the world will not. Wear it like armor and it can never be used to hurt you"
Season two he gets to King's Landing and starts to enter the grey area. A bit of the fun is taken out of him, but he's still everyone's favorite imp. He starts to lie, obfuscate, and manipulate because that's what you have to do to survive in King's Landing. And he does thrive. But he also causes hundreds, perhaps thousands, of men to die a terrifying, painful death. He moves down the gradient. At the end of season 2, he only has Shae left and he seems a bit defeated.
Season 3 the life is just utterly drained out of him under the presence of his father. Closer and closer to the (perhaps literal, if I am correct) dark side.
This leaves me to wonder what horrible things he might do if he reaches that dark side. An intelligent man with a vendetta is not an enemy you want to have...Here's a screenshot for reference. Sorry it's so large, I'm not sure how to resize.