The Olympic swimmer's background isn't exactly squeaky clean. In 2004, he was arrested for driving under the influence of alcohol in Maryland when he was just 19. But in early 2009, just a few months after winning eight gold medals at the 2008 Beijing Summer Olympics, he shocked the world when a photo of Phelps with his head in a bong emerged in the British tabloid, News of the World. He admitted the gaffe and was not prosecuted for his actions but he was suspended by USA Swimming for three months and lost an endorsement deal with Kellogg's thanks to his brief affair with Mary Jane. Way to dive in head first, Mike.