Harry Potter and the Order of the Phoenix
"Oh no, Dumbledore, I am too tired tonight."
Something about Phineas's voice was familiar to Harry, where had he heard it before? But before he could think, the portraits on the surrounding walls broke into a storm of protest.
"Insubordination, sir!" roared a corpulent, red-nosed, wizard, brandishing his fists. "Dereliction of duty!"
"We are honor-bond to give service to the present Headmaster of Hogwarts!" cried a frail-looking old wizard whom Harry recognized as Dumbledore's predecessor, Armando Dippet. "Shame on you, Phineas!" (22.61-63)
[Harry] felt dirty, contaminated, as though he were carrying some deadly germ, unworthy to sit on the Underground train back from the hospital with innocent, clean people whose minds and bodies were free of the taint of Voldemort ... he had not merely seen the snake, he had been the snake, he knew it now ... (23.2)
"So that's it, is it?" he said loudly. "'Stay where you are?' That's all anyone could tell me after I got attacked by those dementors, too! Just stay put while the grown-ups sort it out, Harry! We won't bother telling you, though, because your tiny little brain might not be able to cope with it!" (23.30)