At one point while walking along I had a young lady actually grab my arm from behind to stop me. Her request? Could she use her DSLR to image me pretending to photograph her friend using the Crown. THAT was an unexpected twist. Of course I said yes and dutifully posed. That Crown was a better ice-breaker than anything used by the US Coast Guard.
Old (or old looking) cameras make a huge difference. It's an ancient antique, so you can't possibly be a threat.