When I was taking Jiujitsu, improvised weapons were always part of my gradings,
and were stressed in almost every class that was taught. My instructor was an
unarmed combat and small weapons instructor in the Canadian Armed Forces, and
also a 7th degree BB in Jiujitsu.
It's surprising what damage a hot cup of coffee or the edge of a credit card
can do. In fact, a guy here was just charged with aggravated assault for throwing
a cup of coffee into someone's face. Saw it in the newspaper the other day.

My favorite demonstration was when he would take a large naval orange and slice
it up with a bank card.

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