I'd never do them any harm (in spite of one defecating on my bed at 4AM 5 months ago), but carpetman's description of a pinwheel made me laugh for a long time, a few years ago.
If I had a cat like that I'd shave it's a$$ and teach it to walk backwards. Dang.
A nasty old black or tiger Tom mousin' or rattin' around the farm is a good thing. An ugly flat faced fur ball pukin' and chitin' on the carpet and destroying your $3000 sofa while pissin' into your $5000 speakers is another.