this post was submitted on 04 Sep 2024
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It's not because of anything special about spark plugs, it's because car windows are made of safety glass that's weak to pinpoint damage. The hammers they make for busting out of cars in an emergency are just a little steel spike because all the magic is already in the window itself.
Spark plug ceramic is just a handy combination of light + throwable + likely to land on a sharp point + often found in the proximity of cars.
I thought it was a polarization thing, guess not.