[aaaaaaaaaaab]

You’re supposed to do it like this: https://youtu.be/tZTa8Nh0VlE

[senortumnus]

This reminds me of the spark plug ceramic demos. Little ceramic tip on a spark plug (isolated from the rest of the plug) make an effective car window smashing projectile. No idea if it would work from inside the car / if you could get enough speed on it sitting right next to the window!

https://www.reddit.com/r/mythbusters/comments/130js6/breakin...

[ayemiller]

Technically it's not the tip of a spark plug, but a shard of the ceramic insulator when shattered- https://en.wikipedia.org/wiki/Ninja_rocks

[brokenmachine]

So they crush a spark plug to get the "rocks"? How?