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Tear Jerker: Zero Punctuation
During his Spec Ops: The Line review, Yahtzee finds himself seriously thinking about what message this game sends. It must be seen to be believed, that he's honestly surprised by the game and the things it makes you do, and how it actually affected him. This is best shown in how he regrets using white phosphorus after finding out it murdered civilians, including children, which he himself is no fan of. It was that disturbing, even to Yahtzee.
Yahtzee: *sigh* Do you remember when shooters were about killing demons from hell? Those were good days.
His review of Duke Nukem Forever (For Real This Time) verges into this territory. You can just tell that when he expects a more mature kind of Duke Nukem game, one where Duke is forced to learn that his actions have consequences, in a way growing up, that he was almost certainly grasping at straws, hoping that it would be good. For the rest of the review, though, he knowingly tried and failed to like the game, to find at least some small level of pleasure as he played it, while aware he was failing miserably at that and eventually admitting that he's "pushed games off subway platforms when they had less flaws than this!". Summed up in one sentence:
Yahtzee: "I guess I want it to be good cause that's how the story is supposed to end."
He gets a small one at the end of his Silent Hill Downpour review where he admits that constantly comparing the new Silent Hill games to Silent Hill 2 gave him no satisfaction and actually made him a little depressed.