You know how cats can fixate on an object?

[Katymac]

Ahh, so cute. He is saying "it's mine!"
My boy is currently fixated on a horse rug my dd has borrowed from her riding stables for a school textiles project. He loves sleeping on it and now smells strongly of horse!

BlackCat often "helps" me play Bubble Shooter on the iPad. And then sits on it when he gets bored.

TabbyCat is obsessed with vegetables and shoes. Mainly hiding vegetables in shoes.

Our's is not fixated on an object - he Is fascinated by gravity! He spends his time pushing things off ledges, shelves, etc and then peers over the edge to watch them fall!

You've just described Little Monsieur to a T, Digestive.

He seems to think it's his actual job.. If they're bigger/heavier than him, he gets behind them using his body weight and his head, like a bull.