<p>'I'm going to tell you about the worst thing that ever happened to me.'<br>Will's a nice guy. So when he takes a shortcut to the tube station after a few beers with his mates from work, he steps out of the way of the fellow who's staggering towards him. But he ? deliberately ? moves back into his path. They knock each other as they pass.<br>Moments later one man is dead and another's life is changed forever. Or is it? There are no CCTV cameras...