Very interesting...Window broke because the window rolled down a little after the sledgehammer demo. Since the glass was not fully secured, it flexed when hit by the steel ball more than it could tolerate and broke. The glass is prevented from flexing that much when fully rolled up into the door frame. OMG is this why the Tesla Cybertruck windows broke? - YouTube #Tesla #Elon_Musk https://www.youtube.com/watch?v=PnPcMAwcJJ0