When you first meet the dairy farm people, it seems pretty obvious that something will be wrong with them. Then you spend a while getting to know them, and they seem okay, and you let your guard down a bit.
Then they start slowly doling out the hints that the dairy people are clearly fucked up in some way (being cannibals right up there). I thought this part of the game was fantastic. The twist wasn't really a surprise by this point, but the way the story unravels and you uncover more pieces about who the dairy people are was really fantastic and tense. The fun wasn't in being blindsided by some unexpected twist (which must be impossible to do by now, with how many apocalyptic stories there are), but in how it would be revealed and what characters would be affected.
Great game! If the rest of the episodes keep up this quality, TWD will be tough to beat as my favorite game this year.