So the other night, I ended up at the house of some friends at 8pm, several of us on our laptops on couches and one of us playing Bioshock. I don't remember exactly what the plot point I came in at was, but a while in was the room with all the photos and the spray-painted W.Y.K. (trying to keep minimally spoilery here), and soon after the man/slave conversation, and then the rest of the game. All but one of us stayed up until 5am so we could see it through. WOW so much twisty and creepy!!