Cat on a cold van roof

Well that is the first scare I've had in a very long time. Middle of the night, dead silent, quiet and very safe suburban neighborhood. I heard a thump, and the van shook. I heard scratching and tapping on my van. I look out the window, and see nothing. What? Then I hear more banging on the metal. I do my usual bellowing "HEY!!" bark. And I see a cat quickly climb off the roof of my van, down the windsheild, onto the hood, and leap to the ground, meowing the whole time. Great. I just yelled my fool head off... at a cat.