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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 ...

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

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

The chances of that hitting and causing the break versus the actual metal nut or metal shell hitting first and ultimately causing the break is very slim. I have never been sure as to why people claim a spark plug does a better job at breaking a window versus just a small piece of metal. Like I mentioned above, a metal slug.

www.youtube.com/watch?v=-SYTO4mg1qQ

In this video we show you an exciting way of shattering glass with a spark plug, by putting glass through a variety of tests; Throwing wood, bricks, rocks, sludge, hammers, and other fun stuff ...

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. They have no traditional association with the ninja or ninjutsu, only being n...

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

Spark plug porcelain fragments are sometimes referred to as ninja rocks because of their ability to break glass with ease. Spark plugs are made of aluminum oxide ceramic, which is exceptionally hard. The impact of the shard against the glass creates a tiny structural failing, which rapidly spreads the tension through the rest of the screen ...

ask.metafilter.com/12309

Spark plug pieces have hard sharp points, structurally quite similar to the window punches used by emergency rescure personnel to shatter tempered glass windows. Read a bit more about emergency window removal here .