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

If you're stuck in a sinking car, or outside your car and desperately need to get inside, you have plenty of ways to break that window, but one of the best might be right there in your car anyway ...

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? ... A broken ceramic piece from a spark plug can easily break a car window. Why does it work so well when it weighs so little and is thrown at a slow speed? 622 comments;

ask.metafilter.com/12309

How and why do spark plug pieces break car windows so easily? I found this article pretty easily, ... wouldn't, say, a small sharp rock work just as well? I was under the impression that you could actually just throw the spark plug piece to break the window, and not have to wield it with your hand. If that's true, then somehow it requires far ...

www.answers.com/Q/Does_a_spark_plug_shatter_a_window

It can shatter without having force exerted on it. Rapid heating and cooling causes it to expand and contract, which will eventually form hairline cracks, and can ultimately cause a window to shatter.

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

Why Does Spark Plug Porcelain Break Glass? 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.

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.reshareworthy.com/break-car-window-life-hack

That’s where this life hack for how to break a car’s window is not only useful but it could save a life. National Geographic host Brian Brushwood explains in the video below how a simple spark plug can shatter a car window more easily than a hammer. Car windows are made from tempered glass and are designed to resist blunt force.

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

Physics Why will a piece of ceramic break safety ... Why will a piece of ceramic break safety glass, but a similar sized rock just bounces off? (self.askscience) submitted 5 years ago by r3tr3ad. As can be seen in this video: ... He probably used small pieces because it only takes a very small piece of spark plug ceramic to break a window. http ...