I've ridden a Segway, Bush made two mistakes.
1)He tilted it back and stepped upon it - he threw it into reverse basically and it went right into him. Stepping on it activates it and tilting back goes backward
2)He had a tennis racket in his hand - not the smartest thing to do.
Somebody didn't tell him how to ride one properly, and it is funny as hell (yeah I laughed and laughed hard, because I saw instantly what his mistake was - I saw somebody else do the same thing and it was hilarious). Had he been hurt, I wouldn't laugh, but it is funny.
I do like the Segways, pretty amazing (and the inventor is an interesting guy, too bad we don't have more like him).
That shows that he's in excellent shape and very agile. It's hard to catch yourself like that and avoid rolling on the ground. I fall off horses a lot, and I try to land on my feet, don't always succeed, then it's time for an aikido roll . . . THEN come up on your feet.