this post was submitted on 05 Aug 2026
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Don't forget, as a very squishy bike messenger weaving through endless cars driven by homocidal toddlers, that the ceramic in spark plugs goes right through auto glass, and they're certainly not something such a messenger would carry on their pocket —much like how U-locks are totally not hammers, just waiting silently from their arms-reach holster to defend you. 🫡
I've tried that and been entirely unsuccessful at it. Bounced right off with no damage whatsoever, even when hurled from very close as hard and as fast as I could.
It's just too small and too light to actually break anything.
I've not personally attempted it, ^ahem^ but AFAIK it's fairly foolproof —though my sources* also preferred to grind/scuff down the metal bits a little to help improve kinetic transference. Who knows. 😉
*: NYC alley cats, '97-'11^
Sounds like it'd only work for side windows not windshields.
If, as a bicycle rider, you find yourself in a position where said windshield is the available, target... you should be bracing for impact, instead. 🙃
Some glass can be surprisingly strong to the extent that it feels wrong and unintuitive.
Not auto glass in my anecdote, but last year I had a medium sized aquarium (30 gallons, ~114 liters) where the bottom got broken. I didn't need to fix it because I had a bigger spare waiting, so I decided to break it apart to more easily package the glass into a safe container for disposal or recycling.
I was able to smack that thing on a wide flat surface with a HAMMER and have it bounce right off. They were really hard swings too. My biggest concern was how freaking loud the hits were, like I was going to disturb a neighbor in their house or make them think they heard a gunshot. My second biggest concern was that I was going to fling glass across the yard using so much force. I believe put it into a large bin or wrapped it in something before I got the courage to turn it up to 11 and break the fucker.
I think I used a 3lb drilling hammer too, which looks like a mini sledgehammer. Heavier than a standard claw hammer, just not very pointy.
Auto glass is layered, and designed to shatter in non-sharp(ish) pieces. This helps it break in this fashion. Aquarium glass is not, last I checked.