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

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, causing it to break. Although effective, spark plug fragments will not work all the time.

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

This process also hardens the surface A LOT and makes it quite tough to break, but when it does break, it just "disappears". LAMINATED Safety Glass has a piece of plastic (acetate) in between two pieces of UNTEMPERED glass. This stays "safe" in that it cannot break into shards because it's held together by the plastic.

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

The ceramic is the insulator. I am failing to see how you think the ceramic will hit the glass first and cause it to break. Really any small piece of metal will do it. Like a slug left over from punching a hole in a flywheel or hydraulic press. Even if the very top of the ceramic right below the tip (called the terminal nut) hits.

www.youtube.com/watch?v=z67DKJUgSa4

We wanted to test the urban legend that a piece of spark plug ceramic, warmed to body temp, could break glass. Heres how it goes..... I created this video wi...

www.youtube.com/watch?v=gTaPNPn7kAU

"Why Does A Spark Plug Break A Window? Watch more videos for more knowledge How to break glass with a fragment of a spark plug ... https://www.youtube.com/wa...

homeguides.sfgate.com/ceramic-cooktops-break-easily-85433.html

The ceramic cooktop's design makes it energy efficient and easy to clean. The heating element underneath the tempered glass allows for faster heating when compared to other cooktops. While a ...

en.wikipedia.org/wiki/Ninja_rocks

Legal records do not use the phrase "ninja rocks", preferring more precise phrases such as "ceramic or porcelain spark plug chips or pieces". Until 2003, "burglary tools" in California did not include devices to break glass. In late 2001, two important convictions including possession of ninja rocks were appealed. In People v.

www.quora.com/Why-is-it-the-that-glass-shatters-when-hit-by-a-small-piece-of...

The most likely explanation is that the video is fake. Either the glass was some sort of fake glass that's easy to shatter, or it was shattered by another, undetectable means, or some similar trick. Notice he doesn't throw the rock and nut at the...