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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.answers.com/Q/How_and_why_does_a_spark_plug_break_safety_glass

Um, you probably shouldn't have had glass around the open spark plug hole in the first place. this could make it hard for your spark plug to fit into place, or even send the spark to the cylinder.

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

They have a very sharp, hard point; a decent tap will shatter the glass. This would not work on most other types of glass. The ceramic could leave a scratch, 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 spark that breaks the glass in an explosive ...

www.youtube.com/watch?v=TaYeHc2zOMs

Trying out the theory of breaking a window with a small piece of spark plug on my 1995 Chrysler Concorde I smashed up before I took it to the scrap yard. Yes...

answers.yahoo.com/question/index?qid=20071005095113AAHqdEf

Could have been the heat, or a pebble, or a spark plug. A glass expert told me that heat can shatter a window. And my mom's rear window was shattered from a pebble and we didn't even hear anything except the glass crackling, and saw the pebble stuck in the glass.

www.autoblog.com/2014/02/24/how-to-break-into-car-shatter-tempered-glass-video

How to shatter a car's tempered-glass window using a busted spark plug ... It shows just what it takes to get through a car window and gives a handy hint on how to breach through tempered glass in ...

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

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