how DID curisority kill the cat?

Recalling the most famous saying in the English language - Curiousity killed the cat - I started to wonder, in the most logical bound on how?

A cat is playing with a ball of yarn while grandma is knitting away (or mom or whoever) and this is set in a closed environment. It's just playing around with every movement the ball makes. Just wondering through it's animal instincts how it came to be. Granted that animals don't have a mind of their own but they have their basic instincts.

So how did - then - curiousity, kill the cat?

Did grandma pull it off the rug and throw it out into the street? Did she throw into the tumble dry? Or into the washing machine? Or the oven, for that matter?

Curiousity is a matter of perception and intelligence for the animal kingdom and human kind. For, without it, there wouldn't have been any development in all the fields we now see these days. Without curiousity, we would have sat down and sulked all day because of our damned luck over what fate has bestowed upon us and ended up dying of depression.

Therefore..

Curiousity did not kill the cat. It was it's limited perception of the situation and it's minor intelligence that is less of a human being's.