This thread reminds me of my situation a few years ago. A woman called to ask if I would install a mirror over her fireplace, and I said yes. We arranged a schedule and I took my ladder and tools. It is a large, beautiful home with cathedral ceilings about 18' - 20' high, and skylights above the fireplace.
It was a 6 ft. x 4 ft., floor-standing, 1/4"plate glass, beveled-edge mirror in a 10"-11" wide frame of four stacked mouldings, made in Brazil. Bragging about buying such an attractively-framed mirror for only $600, she wanted me to hang it vertically above the fireplace mantel, which was six feet tall, so the top of the frame would be about 13 feet off the floor.
There was a large, prominently-placed label on the back of the frame, saying something like, "This mirror is intended to stand on the floor. Secure the top edge to the wall according to instructions below, but do not hang on the wall".
I told the customer that I would not hang the mirror, because of the possibility that the frame could come apart and the mirror could fall, causing severe personal injury or death. She was unconcerned and pleaded with me to do the work, but I refused and showed her how the frame could come apart under gravitational stress. Then she asked if I would reinforce the frame. I said no. Then she said her handyman might be able to do the job and asked if I would advise him how to do it. I refused, expressed my concern over any attempt to hang that mirror, and wished her luck.
My guess is that she kept making calls until she found someone who would agree to hang her mirror. Some consumers are just stupid.