Harry Potter and the Sorcerer's Stone
"I went looking for the troll because I – I thought I could deal with it on my own – you know, because I've read all about them."
Ron dropped his wand. Hermione Granger, telling a downright lie to a teacher? (10.142-143)
"Very well," Snape cut in. "We'll have another little chat soon, when you've had time to think things over and decided where your loyalties lie." (13.114)
Malfoy told Madam Pomfrey he wanted to borrow one of my books so he could come and have a good laugh at me. He kept threatening to tell her what really bit me – I've told her it was a dog, but I don't think she believes me – I shouldn't have hit him at the Quidditch match, that's why he's doing this. (14.105)