Cats often... I believe the delicate term is "hork".
Well, not often often, but somewhat more frequently than most humans that aren't either three months old or attending a frat party. This may have something to do with their hairbrush being built into their tongue, and so their digestive tract has to deal with what humans would pluck out of our combs.
Because my desk chair has a cloth seat cover, and is warm from being sat in, and smells like "Mommy", it's one of Rannie's favorite places to lie down, at least on those occasions when I've forgotten to put it under my desk.
Knowing this, I have always kept an old folded tee-shirt on the seat cushion, for as long as I've had the chair and the cat. Just in case.
This morning, I am pleased to say, my foresight finally paid off.
Then I went outside to find that a bird had crapped squarely on the driver's side door handle of my car.
Some days it just isn't worth the effort it takes to pick the lock on the cage in the mornings.