School Days
I was at school in the early eighties when we received a Mac Classic. And I distinctly remember, as part of our very first lesson, being taught that you could pick the mouse up and move it without the cursor moving. Of course, we were kids and had figured this out through experimentation (messing about). But the "IT" teacher - a Maths teacher re-trained - clearly thought this was beyond magical.
That was back in the days when you had to regularly clean the balls on your mice to prevent an accumulation of fluff.