I want to do this so bad.
A few years ago I posted a water jet pack video that quickly went viral. This one by Devin Graham, however, is even more badass. The device is called a "Flyboard" and it's a water jetpack with a swivel board attached to your feet. You can use it to jump through waves like a dolphin or fly up to 45 feet out of the water. Read all about it at the Rocky Mountain Flyboard website. I've never wanted such an unnecessary and expensive toy to badly.