"Well?" said Professor McGonagall, rounding on him. "Is this true?" "Is what true?" Harry asked, rather more aggressively than he had intended. "Professor?" he added in an attempt to sound more polite. "Is it true that you shouted at Professor Umbridge?" "Yes," said Harry. "You called her a liar?" "Yes." "You told her He-Who-Must-Not-Be-Named is back?" "Yes." Professor McGonagall sat down behind her desk, frowning at Harry. Then she said, "Have a biscuit, Potter." "Have -- what?" "Have a biscuit," she repeated impatiently, indicating a tartan tin of cookies lying on top of one of the piles of papers on her desk."