I was at the stoplight next to the middle-aged man riding it. Because he was also stopped, he had to stand up next to the bike as he waited for the light to turn green. Once it changed green, he ran along side it as he pushed the bike's handlebars (which were above his head). He picked up speed as he rounded the corner and was able to jump on.
I called Dusty immediately and told him what I had seen. Apparently, this was old news to him. He'd already seen this man riding his funny bike around town. Crazy.