I attended a group dance lesson tonight. Most of the times, the beginners tend to fumble along, but they somehow manage to do some simple steps, however inelegantly.
Tonight though, we had one couple that simply could not move at all. It was as though they had lead weights tie to their feet. Instead of taking a step, the wife would slide her foot around, and instead of taking a step backwards, she'd move her foot in some strange direction.
The husband was no better. He constantly needed to be coached on even the simplest steps. Stepping to the side was like an absolute chore. It was bizarre.