This guy was my roommate my sophomore year in college. His end of the room was basically a workshop, with all sorts of crazy inventions. I spent many days watching his various robotic walkers and snakes and vehicles work their way around the room, and/or getting pegged with his homemade crossbows and tape ball guns.
He's really put on earth to make stuff like this, and I'm so happy for him that he's managed to navigate the corporate world and actually get one of his ideas out there. This was never a sure thing, because although he's a mechanical genius and incredibly passionate about this stuff, he also might be the most stubborn person I've ever met. He has his own way of doing things and he's completely unwilling to compromise them.
You can read a short feature about him from last year's Wired Magazine here. It's about the 12-foot tall metal version of the spider walker that he built.
As an aside, he's also one of the best athletes I've ever met. He was a decathelete in college.