Vibration cracks a car rear window - GIF

[hemmjo]

Glass is fascinating material.

In my younger days one of my most educational jobs was working in an auto salvage yard. One day, I do not remember the reason, I had to get into a locked car. No big deal, just pick up the steel wheel laying right there. Throw it against the side backdoor glass. Get in. HA, I was shocked when that wheel did not break the glass.

After 4-5 tries, one of the veteran yard men came by, laughing. He had a little ball peen hammer, one smack, not even a hard smack, glass was gone.

I learned a lot working there.