What Games Have Actually Affected You?

FortKnox asks: "What games have affected you simply by playing them? What games immersed you so well into its environment that you actually felt different after playing it? For me, I'd have to go with System Shock 2. Basically the predecessor to Deus Ex, it was the only game that made me so afraid that the minute I heard a matron mother, I turned the other way and ran. What game scared you to death, or made you think after playing it?"