Succeed, and you want to tell the world. Fail, and no one wants to know. Winners turned losers, from presenter Piers Morgan to Olympic hopefuls, open up about their crash-and-burn momentMarc Hemeon, 39, was until recently a senior engineer at Google. Drinking a milkshake and twirling on a swivel chair at his home in Mountain View, California, he describes the app that was meant to make him rich.