My Windshield!

Driving home from work over the weekend going North on the 710 when this unfortunate event occurred. Keep your eyes on the right lane, you'll see some debris coming across, then bouncing up. While I was driving, I saw a glint to that side lining up with the Jeep's tailpipe, and of course there's a loud bang. I thought it was a backfire, and it was at least 5 minutes later before I realized my windshield was broken!

Here's a few stills of the piece coming up. Looked like a disk in the first couple of shots, then it looks cylindrical, then like a flat rectangle.