Robots are serious business. Very serious. They're expensive. They're complex. They're expensive. They're hard to build and hard to program. They're expensive.
For all of these reasons, they make really, really great toys, and the more expensive they are, the more fun they are to play around with. I'm sure that most of the videos of serious business robots being played with by the people who are responsible for them never see the light of day (serious business, remember?), but we love it when every once in a while, a video of some roboticist saying (metaphorically, of course) "hold my beer while I try this" shows up on the Internet for us to enjoy. Like, hey, we've got a robot snake with wheels, let's harness it up and see if it can pull us around! YEAH!