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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. ... Spark Plug vs. Window (that was EASY) - Duration: ... Tips on car buying, how to ...

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.

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

Physics Why will a piece of ceramic break safety glass, but a similar sized rock just bounces off? ... Stupid burglar probably heard that porcelain breaks car windows (Even though it's only a specific kind) and thought it would work on house windows. He probably used small pieces because it only takes a very small piece of spark plug ceramic to ...

www.backdoorsurvival.com/best-emergency-window-breakers-for-the-unexpected

Question, so these window breakers work on the newer regulated side windows that won’t break, as was the case of the woman in Spokane that almost burned to death when her car stalled, electric caught fire, and law enforcement couldn’t even break the window?

www.answers.com/Q/Break_a_car_window_with_porcelain

Break a car window with porcelain? Yes very easily. If i throw a button at a car window will it break? Will the button break? Or will the window break? It depends at the speed of the car and the ...

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

For auto class I came late and my punishment was to take apart a car without breaking the windows. Well, I broke one and we decided to turn it into a science experiment. New park plug porcelains and used spark plug porcelains were used. The used ones went straight through the window whereas the new ones bounced off. Is there a difference ...

ask.metafilter.com/12309

How and why do spark plug pieces break car windows so easily? I found this article pretty easily, ... I've heard that some car thieves use a chunk of porcelain for this task as well. True? posted by Succa at 7:30 AM on November 30, 2004 . You hold the sparkplug in your hand with the metal tip sticking out. Swing your hand at the window and it ...

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.

gizmodo.com/a-tiny-piece-of-porcelain-is-freakishly-good-at-shatter-1527535929

If I had to pick a hammer or a tiny piece of porcelain to shatter a car window, I'd probably think nothing of it and grab the mallet. NatGeo proves me wrong. A little itty bitty piece of porcelain ...