Read this on one of the you tube comments, can anyone confirm it?
Quote:
"The ceramic from a sparkplug attracts negative electrons A cars side or rear window has positive electrons If one were to throw a peice of sparkplug ceramic at a car window the first part of the ceramic that touches the window creates a miner spark explosion which temporarly weakens the glass to an extreme point than the rest of the weight of the ceramic breaks the glass.
You can shatter a car window with a piece of ceramic from a sparkplug about the size of your pinky finger nail. "
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