Guys share ko lang...
About two weeks ago while driving along NLEX northbound, a rock flew from the direction of a 10-wheeler truck ahead of me on the adjacent lane. I saw the spinning rock hit the asphalt ahead, bounced even higher than its initial position, and landed with a sickening sound on my hood on its way down, bounced again, hit the base of left the wiper before going over my roof. Luckily for me, it missed the windshield.
I think it's a rock that was stuck between the rear tires of the truck. It came "unstuck" at speed and since there was no mudguard(!) to stop it, the rock merrily flew and hit my car. The incident stripped a bit of the chrome garnish of the hood and bared what I think is the metal of the hood itself.
Touch up paint to the rescue!
Moral of the story=):
I knew beforehand about this danger when you're behind a truck with gaping space between its tires, just inviting a solid object to get stuck and unstuck. The incident happened before I could get out of the way. I had the mind to slow down, not swerving right or left on the expressway but the squarish rock's timing was impeccable (the rock looked like it had corners).