"Because - oh shut up laughing, you two - because they've just been turned down by girls they asked to the ball!"

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Well, that was a bit stupid of you,” said Ginny angrily, “seeing as you don’t know anyone but me who’s been possessed by You-Know-Who, and I can tell you how it feels.” Harry remained quite still as the impact of these words hit him. Then he turned on the spot to face her. “I forgot,” he said. “Lucky you,” said Ginny coolly. “I’m sorry,” Harry said, and he meant it.

— J. K. Rowling