Quote:
Originally Posted by Drache
Supposedly if you break the ceramic off a spark plug to about the size of your pinky nail and throw it, flick it, or shoot it with a rubber band, etc, it should shatter the tempered glass.
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tested that in high school the entire plug someone drop a plug for the second lever in our shop (its like 12 feet of the ground) the car was raised so the plug fell 4 feet at most touched the rear window and crash barely any force was needed to shatter the window made a bloodly great sound though.