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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;

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.answers.com/Q/How_and_why_does_a_spark_plug_break_safety_glass

That's the key to the whole thing, and why it's surprisingly hard to break a window with a hammer and surprisingly easy to break it with a small, light little shard of innocent white spark plug ...

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.

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 ...

answers.yahoo.com/question/index?qid=20080312151536AAsN87w

I have heard/seen small chunks of Porcelain from Spark plugs shatter an entire car window... can someone please explain to me how this small pebble can shatter a window so easily... also, would a chunk of porcelain from a spark plug be able to shatter bullet proof glass?? or other glass things?? or is it only car windows? Thanks.

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

Breaking into a car is generally a bad idea. That said, it could potentially be necessary to gain access to your own vehicle in an emergency, and it's actually much harder than you might think ...