"OH NO YOU DON’T, LADDIE!” Harry spun around. Professor Moody was limping down the marble staircase. His wand was out and it was pointing right at a pure white ferret, which was shivering on the stone-flagged floor, exactly where Malfoy had been standing."

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You’ll soon find out some wizarding families are much better than others, Potter. You don’t want to go making friends with the wrong sort. I can help you there.” He held out his hand to shake Harry’s, but Harry didn’t take it. “I think I can tell who the wrong sort are for myself, thanks,” he said coolly.

— J. K. Rowling