A few years ago i saw our cat jump onto the recently painted, nicely polished sloped bonnet of my old GT6.
The emphasis in that sentence is on the 'nicely polished' part.
The cat slipped on the lovely shiny surface i had spent far too long buffing to a shiny slippery mirror, started plummeting down the bonnet and stuck its claws in making big scratches all the way down.
Luckily it still had its wits about it after it had landed on the floor to get out of the way of my foot. Once i had calmed down a bit and realised, it was not (completely) the cats fault, after all it was falling, I let it in the house.