‘No, it’s a mammal—’ Tiffany’s mouth said, before she could stop it.
The pictsies were still staring at her.
‘It’s just that he ought to get it right,’ she mumbled, ashamed of herself. ‘It’s a mistake lots of people make.’
You’re going to turn into somebody like Miss Tick, said her Second Thoughts. Do you really want that?
‘Yes,’ said a voice, and Tiffany realized that it was hers again. The anger rose up, joyfully. ‘Yes! I’m me, I am careful and logical and I look up things I don’t understand! When I hear people use the wrong words I get edgy! I am good with cheese. I read books fast! I think! And I always have a piece of string! That’s the kind of person I am!’
She stopped. Even Wentworth was staring at her now. He blinked.
‘Big water cow gone . . .’ he suggested, meekly.
Terry Pratchett, The Wee Free Men