Playing The Nameless Mod. There's a part where you have to hire a pilot to take you to the last location in the game. The game itself is all about experimentation and exploration. So what'd I do? That's right, I killed the pilot, just to see what would happen. Would the game even let me do that? Would it force me to restart?

The reaction was hilarious. My character wound up having to fly the helicopter himself to the next area of the game (done in cinematics, not actually controlled by the gamer). And instead of a safe landing, the helicopter crash-lands (because the player character is not a trained pilot), and the result is that you start the final, hardest chapter of the game with no equipment whatsoever and minimal health.

This game is all about consequences for player behavior; stealing from the shops catches up with the player later, as does how you treat other characters. It isn't just about how you respond to them in dialog, but if you e.g. agree to help them and screw them over.