Apparently Rinspeed developed this vehicle long before their sQuba car, but it's just making its rounds on the internet, so here it is. The Splash is a little sports car (0-60 in 5.9) that, with the push of a button, turns into a little hydrofoil boat capable of 45 knots (~52 mph). It's powered by natural gas and there's no word on price or if they're even available. I really admire Rinspeed for their multipurpose vehicles, but it seems they can't think outside the land/water box. Try this one on for size Rinspeed - the Blastoff. It's a car and a rocketship. You can drive it to work or the freaking moon. It's got wheels and an engine like a car, but it also has hyper-thrusters and all that space technology stuff too. Yeah, and it's modeled after an old El Camino. Is that specific enough to secure a patent? I don't want anybody stealing my idea.
