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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.youtube.com/watch?v=QhlmKHbPFhU

Mike shows how porcelain from a spark plug can break glass with ease. Then tries to do the same with a rock. Why doesn't he just use the hammer? Because this is not a video on how to break glass ...

www.youtube.com/watch?v=2yVK2nNnmUE

Spark Plug vs. Window (that was EASY) Cleetus McFarland. Loading... Unsubscribe from Cleetus McFarland? Cancel Unsubscribe. Working... Subscribe Subscribed Unsubscribe 1.72M. ...

www.liveleak.com/view?i=a5d_1257946254

Added: Nov-11-2009 By: jackal452 (1400.80) Tags: MythBusters, spark plug, ceramic, car, auto, automobile, glass, window, shatter, ninja rocks Location: Overijssel ...

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

They can also be used to break the side window of vehicles. Spark plug... Tiny shards of spark plug porcelain have small hard points which allow them to easily find a breaking point in glass. They can also be used to break the side window of vehicles. ... Spark plugs are made of aluminum oxide ceramic, which is exceptionally hard. ...

www.reddit.com/r/askscience/comments/2w7ken/why_does_a_piece_of_a_sparkplug...

You say this as though you think the ceramic will actually hit the window first. It won't. Sit a spark plug down. The metal on the top and the metal of the hex is what touches. Or the metal threads. Or the metal arm that sticks up over that arcs the spark. The ceramic is the insulator.

ask.metafilter.com/12309

How and why do spark plug pieces break car windows so easily? ... Because the little metal gizmo on the end of the spark plug is concentrating all the force you apply to the window into one little teeny spot on the window. ... spark plugs are made out of fairly hard material, and if broken spark plug insulators (the ceramic part) are used to ...

www.ar15.com/forums/t_1_5/1196280_Spark_Plug_Ceramic_to_Break_Glass_.html

So, apparently I'm not up on my car theft techniques. I finished up the second Day by Day Armageddon book last night and read about the part where the main character used a few small shards of spark plug ceramic to shatter a tempered glass window, with nothing more than a light overhand throw. This sounded really odd to me, so today I did some looking online, and it seems there is truth to thi...

www.answers.com/Q/Is_it_only_spark_plug_ceramic_that_breaks_windows_or_can_any...

Is it only spark plug ceramic that breaks windows or can any ceramic be ... basically any hard substance formed into a small point will break a window as it is focusing all the impact force to a ...

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

Shatter a Car Window with a Sparkplug in an Emergency. You may also like. The Takeout. ... but throwing the ceramic at the window is probably safer from the outside (since the glass is designed to ...