So he's hiding from the foreman. I hope nothing gives him away.
Instructables user dhouggy wanted to ride his bike indoors but didn't want to pay hundreds of dollars for a trainer or professionally-made roller. So with a couple 2x4s and some PVC pipe he was able to craft this working homemade model for just $50.
Zapata Racing just released the Flyboard, a water-powered jet pack available to the public. The Flyboard gets it propulsion from a jet ski idling nearby; its hose forces water to shoot out of the user's feet. Not as cool as a the real deal the public is waiting on, but I guess this is a happy medium for now.