Really it's why I can't have nice things.
Cats have scent glands on the sides of their faces, the bases of their tails, on their legs -- really, where don't cats have scent glands? And they like to rub those scent glands on things that are important to them. Over and over and over again they like to rub.
Until you get something like this leg on my desk:
Notice where the black is all gone? That's from cats rubbing off the finish and rubbing on their scent. But the worst thing is they only do it to my desk, never to Kent's.
This is why I can't have nice things. They'll just rub em to death.