Hi jfc,
English is such a well developed language. It's almost infinite subtelties allow us to express such finely honed nuances of meaning with the changing of a single word. The single word you've stumbled over here, jfc, is "us".
When I read Crash's formula I spent a few seconds on his explanation and, as I expect you already realise, knew just what he was expressing but then I wondered if he'd been drinking from the same cup of pedantry that you so heavily quaff on occasions. What about the poor Joes that can't understand this I thought, don't they deserve to learn. I suppose I could have said "Better give the dullards an example.....", or "Better give the mathematically challenged an example...." but no, that would be cruel and I'm not too proud to lump myself in with the common man "Better give us an example....." is so much more friendly.
But anyway, I'll assume you though I was using the Royal "us" so thanks for helping us mere mortals by simplifiying the whole thing for me.

KV