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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.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...

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.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.

ask.metafilter.com/12309

How and why do spark plug pieces break car windows so easily? ... 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. ... which are made of safety glass and are designed to break into neat, almost square little pieces. For whatever reason, the side seems to be ...

www.bluesheepdog.com/breaking-glass

Typical spark plugs use porcelain as an insulator. A quick whack with a hammer will break the porcelain into small pieces. Those small pieces of porcelain will easily shatter a car window when they are thrown. Most cops who have been on the street for a while already know about the spark plug trick, but search for “breaking glass spark plug ...

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

Physics Why will a piece of ceramic break safety glass, ... Why will a piece of ceramic break safety glass, but a similar sized rock just bounces off? (self.askscience) ... Several people have suggested that the charge of the glass and the ceramic from the spark plug create a spark that breaks the glass in an explosive way. This is a myth.

lifehacker.com/shatter-a-car-window-with-a-sparkplug-in-an-emergency-1540780900

The direct force on a small area applied by the sparkplug ceramic is enough to punch through the safety glass, which is designed to absorb great force over a large surface area without breaking ...

www.quora.com/Can-bulletproof-glass-be-shattered-to-pieces-when-fragments-of...

TL;DR: No. Typical commercial and residential glass and bullet resistant glass are made very differently. First off glass is a very broad term, the same as saying automobile. There are various types of glass. Tempered glass is often used in the in...