Newfangled

Walking home today, I saw a middle-aged guy careening down the sidewalk on what appeared to be wheels. But he wasn't riding a skateboard or wearing Rollerblades. Did he have wheels attached to the bottom of his regular shoes?

No. He had two mini skateboards, one for each foot. They were squarish and silver, and they looked hard to manage. His legs kept shooting away from each other, since he basically had to face forward and sideways at the same time to stay balanced.

It was all kind of ridiculous, but he seemed to be having a blast. What will they think up next?