You are with a group of friends in a bar on a Friday night and one of them has had rather a lot to drink – much more than he usually does. He seems happy, despite slurring his words and taking a few moments to get his balance. But, as he slurs his goodbye at the door of the bar, it flashes through your mind that maybe you should walk him home. ‘Nah’, you think, ‘he’ll be fine’ – and he would certainly protest. Ten minutes later he stumbles and falls into the river and drowns. Did you have a duty to walk him home? What about the others in your group? Moreover, might that duty have been a legal one?