Here's one more: a jet-powered flying motorbike that can hit 150 mph and happens to be carrying four Spike missiles.

When Franky Zapata showed off his Flyboard earlier this year, zooming through the air 7,000 feet up at 55 mph, I knew a military version of the Green Goblin-inspired transportation would surely follow.

So I thought up the Zaxon, a tactical vehicle that uses that turbojet technology to deploy special forces on the ground to a target less than 100 clicks away, possibly after dropping from a Lockheed Martin C-5 Galaxy.

The size of a standard touring motorcycle, the single-seat Zaxon would use two larger engines up front, and two smaller ones in back. The jets could tilt slightly for liftoff, landing, or full-speed flying. The large fuel tank would sit inside the bike, taking the space usually occupied by a motorcycle engine.