I'd bought a whole load of 2 metre X 1 metre sheets of glass and asked a friend to help me move them. I had the proper glass hand suction clamps. After one or two he said he had a sore back and left
Over the next few weeks he complained about his sore back to make me feel in debt to him or something. Then he asked me how I got them moved. I said "I'm stronger than the two of us put together, I moved them myself LOL" That shut him up.