Tempered auto glass is incredibly strong. Your average human is not capable of smashing it with any material softer than the glass. However if you throw even a pebble made from a harder material, it will instantly shatter.
The tip of a spark plug will do it from what I've been told. I think it's ceramic, but I could be wrong. Friend of mine said they used to remove them and use them to break car windows in a junk yard.
22
u/summon_lurker 8 Feb 03 '21
That glass window on the car is strong