https://en.wikipedia.org/wiki/Nonholonomic_system

what about unicycles and nonholonomic systems....remember how fond of unicycles, daldry was?

hmmm....not as interesting or funny as 'falling cat'....go figure:

https://en.wikipedia.org/wiki/Falling_cat_problem

I always thought that you could learn a lot from just 'watching' cats....perhaps more than debating nonholonomic systems...

https://en.wikipedia.org/wiki/Falling_cat_problem#/media/File:Falling_cat_1894.jpg