Tell me about a time a teacher or a parent or someone else in authority told you something that you knew immediately was wrong.

Oh dear. You asked. I've had a bee in my bonnet about this for the last eighteen years!

It was grade three. We were studying units of measurement (metric, because this is Australia.) We'd done kilometres, and now we were on to kilograms. A penny dropped in my head. A thousand metres, a thousand grams...
"Miss B_, does 'kilo' mean a thousand?"
And with the most patronising tone imaginable, she replied "No, Ellie, *kilo* is short for a *kilogram*."