TIL of “ninja rocks,” shards of spark plug ceramics. Harder than tempered glass, when thrown at car side windows they can easily cause those windows to shatter.

Read more: https://en.wikipedia.org/wiki/Ninja_rocks

What do you think?

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  1. 50% of the comments are “uh who didn’t already know this” and the other 50% are “how dare you release this forbidden knowledge on the unprepared masses”

  2. Feel satisfied that through this post you will undoubtedly cost people possibly hundreds if not thousands of dollars. Some people may do a stint in jail, some may lose a job. Who knows. But well done.

  3. I heard the rumors of this when I was a kid and we tried it on the front windshield and it didn’t work, we never tried the side windows…

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