All you've gotta do is unscrew that little hinge, and BOOM: You've got two small knives.
I know that knives are easier to harm with, but scissors can pretty much be used for the exact same thing. I'm not suggesting a ban on scissors or anything, but... why?
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Scissors, particularly in schools tend to be much less sharp than knives. I've tried cutting myself with scissors, failed and had to resort to my nails.