Wandering and photographing London one winter's day, I found myself near the gates of Buckingham Palace. I had my tripod slung over my shoulder, but the strap was long enough to permit me to carry the legs horizontally at waist level, with the tubes more or less pointing at the horizon. Two policemen on horseback approached me and asked to see some identification.
While this transaction ensued, they demonstrated particular interest in my black tripod and suddenly I realized that I looked exactly like a weapon-bearing commando.
Oops.
I apologized profusely and moved on, resuming my more usual on-the-shoulder tripod posture.