“I don't need a cloak to become invisible.”

“Death's got an Invisibility Cloak?" Harry interrupted again."So he can sneak up on people," said Ron. "Sometimes he gets bored of running at them, flapping his arms and shrieking...”

“Well, here goes," said Harry, and he raised the little bottle and took a carefully measured gulp."What does it feel like?" whispered Hermione.Harry did not answer for a moment. Then, slowly but surely, an exhilarating sense of infinite opportunity stole through him; he felt as though he could have done anything, anything at all...and getting the memory from Slughorn seemed suddenly not only possible, but positively easy....He got to his feet, smiling, brimming with confidence."Excellent," he said. "Really excellent. Right...I'm going down to Hagrid's.""What?" said Ron and Hermione together, looking aghast. "No, Harry - you've got to go and see Slughorn, remember?" said Hermione."No," said Harry confidently. "I'm going to Hagrid's, I've got a good feeling about going to Hagrid's.""You've got a good feeling about burying a giant spider?" asked Ron, looking stunned."Yeah," said Harry, pulling his Invisibility Cloak out of his bag. "I feel like it's the place to be tonight, you know what I mean?" "No," said Ron and Hermione together, both looking positively alarmed now."This is Felix Felicis, I suppose?" said Hermione anxiously, holding up the bottle to the light. "You haven't got another little bottle full - I don't know -""Essence of Insanity?" suggested Ron, as Harry swung his cloak over his shoulders.”

“A Wrackspurt . . . They’re invisible. They float in through your ears and make your brain go fuzzy,” she said. “I thought I felt one zooming around in here.”

“Your great puddin' of a son don' need fattin' anymore Dursley, don't worry”

“You look in excellent health to me, Potter, so you will excuse me if I don't let you off homework today. I assure you that if you do die, you need not hand it in.”

“Howard and Shirley were clothed, always, in an invisible layer of decorum that they never laid aside.”