1964 Barracuda video Back Glass breaking!

I used to work at the Detroit McGraw glass plant that made those backlites, sidelites and windshields for a lot of the mopars that we now try to save.. Gah!! I had to load them as they came off the furnace onto a carrosel tobe washed and quality checked, than packed for shipment , I hated that glass. we used to throw ice cube's down the line to get a short break (yup they blow up nice when they are hot.) any way you can do almost anything to that backlite after it has been qeunched EXCEPT put a pressure point on the edge, ie.. rock or center punch ect. we had to tape up and break one with acenter punch on the edge the glass to check the break pattern for saftey checks once an hour , man did that eat up tape. During a show and tell for the higher ups we took one and laid it on the floor just like it would go in a car and one of the guys (300 plus pounds) jumped on it. man you should have seen the mucky mucks scatter, it was great. glass went almost flat to the floor and bounced that guy about 8 foot away (we scattered then.) but the glass didn't break. we initialed it and later found out that it went into a supervisors car how's that for tough
if ya want to make sure not to break a quenched piece of glass lay it flat OR use that split pipe wrap on the bottom edge, if it's saftey laminated glass from the front windshield all bets are off . those things break just looking at em