Some years ago I had a minor encounter at the mall with a young, "urban" employee who had to give me a hand-written credit.
The amount, as she wrote it, was incorrect, which I pointed out to her. She said, "No...that's just the way I make my 7s."
It not only did not look like a 7, it looked like a 5. Not ambiguous as thought it might have been either a 5 or a 7...it was clearly what most of us recognize as a 5 and would never question.
Her quick, defensive response to me made it clear that she had been frequently challenged on her idiosyncratic habit of making her 7s exactly like what the rest of the world regards as a 5.
Her self-esteem was so great that she saw no need to conform to the boring way that everybody else makes 7s.
But she conformed for me, by God.