Harry Potter and the Prisoner of Azkaban
Professor McGonagall broke off, and they saw that her nostrils had gone white. She went on, more calmly. "Divination is one of the most imprecise branches of magic. I shall not conceal from you that I have very little patience with it. True Seers are very rare, and Professor Trelawney –" (6.1.126)
"Why don't you just drop a couple of subjects?" Harry asked, watching her lifting books as she searched for her rune dictionary.
"I couldn't do that!" said Hermione, looking scandalized. (12.5.63-4)
Trying to answer a question with Hermione next to him, bobbing up and down on the balls of her feet with her hand in the air was very off-putting, but Harry had a go. (7.2.34)