Whenever I teach something outside the basic kihon curriculum, which is often, I am always amazed at the lengths students will go to, to avoid doing what has just been demonstrated.
You can look down the line on the mat and every nage is doing something different, none of them what they are supposed to. (Occasionally, even uke is doing the wrong thing, but that is perhaps a different story. Or perhaps not).
We are not talking complicated techniques here, just basic body movements, so it is impressive the levels of imagination required to come up with these new, convoluted and totally ineffective ways of expressing what they thought they had just been shown.
This then begs the question: What the hell are they seeing when I am teaching?