Would you expect anything else from a CEO of two companies and chairman of another? His advice for entrepreneurs: "Work like hell." It hasn't all been good vibes, though. 

Before all of Musk's recent success, there was a moment in 2008 when he had a humongous decision about the future of SpaceX and Tesla. To him, they were basically his children, and it came to a point where he had to choose how to distribute his funds. He could put all of it into one and kill the other or spread the funds to both and risk losing it all. Obviously, he chose the latter. 

"I never thought of myself as someone who could have a nervous breakdown, like, 'what kind of pussy has a nervous breakdown?' ... but I came damn close," Musk said in an interview with Business Insider this week