That's exactly why I refuse to live in any large city anymore.
I talk to strangers all the time. If I see a clip sticking out, I'll usually ask, Hey, is that a _____ you've got there? Taking a guess, and I'm not always right, but at least this conveys to the guy that I'm interested in the knife for the knife's sake not for any ulterior motive.
I was at a party this last weekend and noticed a guy there with a CRKT sticking our of his left hip pocket. Since he was wearing a jacket I "made" him on the spot that he was carrying the blade for weapon retention and sure enough, we talked a bit, he was a cop and left his gun in the car, as did I, but we both still carried our knives in with us.
Pretty soon he was bragging about how fast he could get the CRKT open and was really proud of himself until I showed him how the Commander wave works. He'd never seen one and I'm pretty sure he's ordered one by now.
Made a friend of him and we're going out to shoot IDPA this weekend!
So yeah, I always talk to strangers.
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Tráceme no sin la razón, envoltura mi no sin honor
Usual Suspect