From stolen kidneys to phantom hitchhikers and the missing brain of JFK, we all love a good story (the more extreme the better), but sometimes they end suspiciously neatly, however much the teller swears they know the person it happened to. And it's not just word of mouth; we are bombarded by chain letters and emails, newspaper articles and TV programmes all spinning stories of ghosts and revenge, of bizarre scientific breakthroughs, of political...