Vibration cracks a car rear window - GIF

[RetiredFAE]

Repo'd cars when I was younger, old timer taught me to take a spark plug, put it in a paper bag, hit it with a hammer and shatter the porcelain insulation.
Take a piece of it the size of your little fingernail, and flick it against the glass window, it would shatter and fall out quietly. The razor sharp edge of the porcelain chip did the trick.