Heh
I can confirm that the broken ceramic from a spark plug is a tried and tru way of putting a big hole in cart glass.
I actually was taught that trick by an asian friend in highschool who used to steal cars.
I didnt think it worked, so I threw a spark plug on the ground, shattered it, tossed a couple of pieces at a passenger window (nobody inside of course), and POW. a fist sized hole broke stright through.
I dont really reccomend doing this, but yea it works.
Ball bearings? Yikes. =)
I think Ill stick with getting an air horn, a few LED lights to make the bike more visable, and a laser pointer always works good too in the eyes of a cell phone moron. =)
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