Sadly, we had a casualty last night.

Nice crack in the "impact resistant" window. Thankfully I wasn't standing there.
The victim was the top right block. Thankfully the others seems unscathed.
The block was hurled through the impact resistant polycarbonate, and landed about 15 feet from the machine:

(don't hate, I KNOW my shop is a MESS. no time to clean)
I was looking all over the machine for the block at first because usually they just fall off the table, but this one was thrown with tremendous force. Enough to go THROUGH (not just bounce off) the polycarbonate, and land 15 feet away with the end mill still buried inside:
Sadly, this will set me back a little while. I have to figure out how to drill out, and re-tap the holes where the bolts sheered out of the plate, not to mention purchase a new end mill and more copper.