Maybe I'm just a big robotics nerd, but I actually rewound and repeatedly watched the actual moment where Asimo's right leg collapses and he takes a nasty spill down the steps. Five times. Is it also silly that I was nervous, mostly for the engineers, the first time I saw this? Asimo looked so timid, while simultaneously courageous, as he lined up to take his first step. In front of all those people. Oh, the horror.

That's an amazing bit of engineering.