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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 ...


Trying out the theory of breaking a window with a small piece of spark plug on my 1995 Chrysler Concorde I smashed up before I took it to the scrap yard.


In Part 1 we learned porcelain from a spark plug can break glass but what about other porcelain like a toilet? Does this only work on auto glass? and more questions answered from part 1.


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


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.


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.


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.


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 ...