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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=i8-mJuQLRbM

BREAKING WINDOWS WITH SPARK PLUGS!!! Cody B. Loading... Unsubscribe from Cody B? ... How to Fix a FREE CAR that Cranks but Won't Start - Duration: 16:01. ChrisFix 4,937,494 views.

www.reddit.com/.../comments/2w7ken/why_does_a_piece_of_a_sparkplug_work_so_well_at

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...

ask.metafilter.com/12309

As the article you linked to mentions, spark plugs are made out of fairly hard material, and if broken spark plug insulators (the ceramic part) are used to break into a car, their jagged, sharp edges may be a factor as well. posted by Vidiot at 7:03 AM on November 30, 2004

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

How and why does a spark plug break safety glass? ... If one were to throw a peice of sparkplug ceramic at a car window the first part of the ceramic that touches the window creates a miner spark ...

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

The easiest thing is to have a car hammer/car window escape tool in your car’s emergency kit. The devices are inexpensive and not only shatter car windows but often have seat belt cutters included. If you do not have a car hammer or any other tool that can be used to break the glass, you can try using a spark plug as Brushwood demonstrates in ...

www.reference.com/vehicles/break-window-spark-plug-bf6745278a448dab

In order to break a car window's tempered glass, the porcelain insulator inside of a spark plug can be used. Unglazed porcelain is rated 7 on the Mohs scale of mineral harness, while glass is rated 5.5. To shatter a car window with a spark plug: Obtain the spark plug's insulator; Spark plugs generally use a porcelain insulator.

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

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 plug porcelain fragments are sometimes referred to as ninja rocks because of their ability to break glass with ease.

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 ...