Flyboard Air

We're getting closer and closer to real hoverboards — and unlike the one BTTF, this one most certainly can run over water. The Flyboard Air is still a prototype, but it just carried its company's founder well over a mile up the coast of France, setting a Guinness World Record in the process. It's propelled by a jet unit that can run for up to 10 minutes, hit speeds of over 90 mph, and fly up to 10,000 feet in the air (not that it's recommended). The result of four years development, it's sadly going to need at least one more before it comes to market.