Had to laugh.
Some time back, I was working a gig, when a youngster (under 30) asked if I had a can opener - dunno, maybe he thought OFs carried such a thing. (I do, a P-51 is part of my key chain bundle)
I asked what he really needed. He wanted to open a coffee can. I pointed to his belt - he was carrying a leatherman tool. (IT Shop - he used it to open boxes)
I told him he already had a can opener. The look of disbelieve was priceless.
Rather than laugh - I took him in the kitchen and showed him how his can opener worked.
He was nice enough to bring a me a cup of coffee after it brewed.
Moral of the story - you should know how every tool you own/carry works, even if just a Swiss Army knife. Also, if you have not seen something done, it may be a mystery. Don't laugh or mock - demonstrate.
Makes for a better workplace....