I have a cat just like that, he thinks he's small and wiry like his sister, and that he can be as agile as her, but he's just a big boned, pleasantly plump cartman. I could see him attempting this stuff, with the same result being him splayed out.
I have a 20 plus pound cat That I'm amazed at the places he can fit into. You wouldn't think a cat his size could fit in a shoe box but he sleeps in one all the time.
I think somebody dropped this cat on its head.
thx, there's my smile for the day =]