Balancing on a Cow

For the benefit of the lady with the baby, balancing on the ball goes like this:

Imagine sitting cross legged on the ground. Imagine in front of you a large purple ball that you can only just see over (all that was just so that you could get an idea for the size). Now, get up off the floor and plonk yourself on the ball in a sitting position. Now, imagine taking your feet off the ground and maintaining your balance. (hmmm… suspect you will be imagining it to be easy – doesn’t sound that hard, eh).
So actually, let’s try this. You know those things that you see on American movies where there is a mechanical cow with no head and no legs that wobbles about and always has a blonde girl with big boobs, wearing a cowboy hat on it (I think they’re called a “bucking bronco” or something)? Imagine yourself on one of those trying to balance a book on your head – no holding on to it now. That’s what it’s like trying to balance on one of those damn balls.