"A male usually had made up his mind before you began to talk to him -so why bother?- but a female, because her mind was more supple, was always prepared to become more disappointed in you than she had yet suspected possible."

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Miss Granger, you foolish girl, how could you think of tackling a mountain troll on your own? Five points will be taken from Gryffindor for this,” said Professor McGonagall. “I’m very disappointed in you.” Hermione left. Professor McGonagall turned to Harry and Ron. “Well, I still say you were lucky, but not many first years could have taken on a full-grown mountain troll. You each win Gryffindor five points.

— J. K. Rowling