Towards the end of 'Stranger Than Fiction', Harold is struck by a bus and his life is saved by his wrist-watch.
The scenario I'm considering doesn't exactly have to be a pedestrian-bus collision (pedestrian-car or car-car will suffice) but I'm curious as to medically speaking, how can a wrist-watch save someone's life?
At first glance, this seems nearly impossible as a wrist holds no vital organs (the only thing I can think of is bleeding to death and the watch's tight grip prevents one from bleeding out - and even that, I'm not entirely sure if it's a realistic scenario) but considering how collisions almost always split-second, how can a watch save someone's life?