Yes and no, It was not really a dance but quite weird.
It was while printing with an litographic printer. The principle there is that the water-seeking areas of the plate (eg: Aluminium) take water from the rollers while the fat-seeking areas take ink from the same rollers, then paper is rolled between the cylinders so the inked areas deposit ink on the paper and the watereed areas just deposit a bit of water.
Sofar, so good. but printers are not all alike some cylinders are wider than others and sometimes you have to cut the excess width of a plate that is too wide, that is done with a pair of heavy scissors and you need to excert some force to cut (aluminum is a metal after all, even when pressed thin). Anyways I was cutting plates one day for my printer, when I discovered the room had gone quiet. Everyone else had stopped working and was watching me cutting plates. Have you noticed how your off-hand can write mirror image letters as easily as you right hand can write? we have a lot of that kind of resonances. Another is between hands clenching and the jaws biting down, that is what I was doing, firmly working my jaws biting nothing while my right hand was powering the scissors. Then we all laughed and went back to work.
Perhaps three years ago, I was dancing at night in my living room to some slow pieces by Connie Francis on the stereo with an imaginary partner when, in the middle of the Tennessee Waltz, I noticed my window was wide open and the curtains drawn aside. I might have been seen, I'm not sure.