Perhaps I worded it wrong:
Many people I have met, prior to giving this class, haven't known what the hook is.
I gave the class, and a couple of people didn't know, so we backed up a little and explained what it was, then continued on to how a machine makes a stitch.
All the ladies and men in the class left knowing how to determine which way the needle goes and which way to thread. :)

Lots of people I meet don't know that there's tension adjustment on a bobbincase either. Anyone who buys a machine from me leaves with a pretty solid foundation in tension theory. I don't like comebacks. ;)

Nice! Sounds like a good syllabus.

Thanks! It seemed to work out quite well. I had a blast too! :)