It's called the Rising Sun, it's 450-or-so-feet long (one of the biggest private yachts in the world), and it reportedly cost more than $200 million to build. This floating ego-booster is so big, in fact, that finding a dock is occasionally challenging. Ellison once said this about his megayacht: "I made a mistake, making Rising Sun so big. It is one and a half football fields long." Today, Ellison actually co-owns the vessel, with entertainment mogul David Geffen, which might make for tricky scheduling problems.