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en.wikipedia.org/wiki/Ninja_rocks

Ninja rocks are broken shards of spark plugs that are formed by smashing the ceramic portion of the spark plug with a hammer or other large object. Since they can quickly and quietly fracture the glass side windows on most cars, ninja rocks have been used in "smash-and-grab" auto burglaries since at least 1995.

www.reddit.com/.../comments/2w7ken/why_does_a_piece_of_a_sparkplug_work_so_well_at

Physics Why does a piece of a sparkplug work so well at breaking car glass? Why does a piece of a sparkplug work so well at breaking car glass? (self.askscience) submitted 4 years ago by ... So in the case of the spark plug shard, which is made from a hard ceramic (likely an alumina based material) the impact from the ceramic is enough to form ...

www.reference.com/vehicles/spark-plug-porcelain-break-glass-1cef09016e3d3e5e

Although effective, spark plug fragments will not work all the time. Spark plug fragments may not break glass if they are not sharp enough or thrown with too little force. Spark plug porcelain shards are also less effective on windshields because these come with a special laminate feature that reinforces their resistance to impact.

www.ebay.com/sch/i.html?_nkw=glass+spark+plug

New Listing VASELINE URANIUM GLASS SPARK PLUG BARNEY GOOGLES HORSE (( ID197531 )) $9.95. Time left 6d 20h left. 0 bids ... 8PCS1200° Glass Fiber Spark Plug Wire Boot Heat Sleeve Protector Covers SBC BBC See more like this. 1923 Painted Glass Candy Container Spark Plug Mule Barney Google Comic. Pre-Owned.

www.reddit.com/.../comments/1nmeu7/why_will_a_piece_of_ceramic_break_safety_glass

Why will a piece of ceramic break safety glass, but a similar sized rock just bounces off? ... The same concept is used by the glass-breakers that some people carry in their glove-compartments. ... but that is all that would happen. Edit: Several people have suggested that the charge of the glass and the ceramic from the spark plug create a ...

en.wikipedia.org/wiki/Spark-plug

A spark plug (sometimes, in British English, a sparking plug, and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within the engine.A spark plug has a metal threaded shell, electrically isolated from ...

www.bladeforums.com/threads/why-have-a-glass-breaker-on-a-knife.555210

A small glass breaker on the otherhand can tackle most automobile windows (laminated or not) and create the cracks and the opening you need to open the window. If you keep a knife in the car its a great idea to have a knife with a cutting hook (for seat belts) and a glass breaker. So for rescue purposes such a feature is a life saver.

lifehacker.com/shatter-a-car-window-with-a-sparkplug-in-an-emergency-1540780900

Shatter a Car Window with a Sparkplug in an Emergency. Alan Henry. ... this video that if you break off a chunk of ceramic from around the sparkplug and use it against the car window safety glass ...