Edge: So I'll confess: watching Planet Earth turns me into a nervous wreck. I know a lot of people like to get buzzed and watch the ducks cruise the mountains in high-def, but when I watch the show, all I see is the killing. The fox with the gosling in its jaws. The harlequin shrimp dragging a starfish into their lair to feed on it for days. Yes, I knew that nature's a little Darwinian, but when you watch it hour after hour you realise what it means when the fittest and the luckiest survive. There is no right or wrong: the winner's just the one who didn't get eaten.
That lesson came back to me when I finished the single-player campaign of Modern Warfare 2. (And warning: spoilers follow.)