Outfitted with a 1500cc engine, a watertight cockpit and six dolphin-like fins, the Innespace Seabreacher redefines personal watercraft. The 17-foot vessel can reach 50 mph on flat water, cruise beneath the surface, and launch 18 feet in the air. It’s also got and iPod-compatible sound system and a digital periscope. Looks a bit tail-heavy, but also very, very fun. Via popsci.com.