Pulling out a knife is cool for a kid. Just showing it off. That can result in trouble.
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Hell, back 16 years ago, I was attending classes in a local tech school, where they were also running a local Police Academy. One of the cadets (an adult sheriffs deputy) would hang out in the halls with his classmates between classes, and he would constantly flick open his large tactical folding knife.. I observed many scared looks from bystanders, over the weeks of me attending class there. He was oblivious of how this was intimidating and could get him into hot water. And he was an adult...
Ya, a Swiss Army knife is MacGuyver approved?