"So, the train isn't good enough for the famous Harry Potter and this faithful sidekick Weasley? Wanted to arrive with a bang, did we boys?"

"Shut up, Hermione!"

"Mr. Malfoy then saw an extraordinary apparition. Can you imagine what it might have been, Potter?"
"No," said Harry, now trying to sound innocently curious.
"It was your head, Potter. Floating in mid-air."

(After the Marauder's Map scribbles all those insults when Snape was trying to get it to 'reveal it's secrets.')
"So..." said Snape softly. "We'll see about this..."

"THIS HAS SOMETHING TO DO WITH POTTER!"..... "OUT WITH IT, POTTER!" he bellowed. "WHAT DID YOU DO?!"

"Where would you look if I told you to find me a bezoar?"

"This is Veritaserum. It is a powerful truth potion. So watch your step, or one day I might accidently let my hand slip..."

"Or maybe, he's waiting to hear why you two didn't arrive on the school train."

"How are you supposed to watch all three heads at once!?!"

(After Harry sees him and Filch in the teacher's lounge)
"POTTER! GET OUT! OUT!"

"...flee then, I will make your excuses for you. I, however, am staying at Hogwarts."

"I think they were under a Confundus curse, minister."

"Potter and his friends may have simply been at the wrong place at the wrong time. But we do have a set of suspicious circumstances here. Why was he in the upstairs corridor at all? Why wasn't he at the Halloween feast?"

"Then again... maybe some of you have come to Hogwarts in possession of ability so formidable that you feel confident enough to not pay attention!"

"I can teach you how to bottle fame, brew glory..."

"Fascinating though your social life undoubtedly is, Miss Granger," said an icy voice right behind them, "I must ask you not to discuss it in my class. Ten points from Gryffindor."

"Give me a reason," he whispered. "Give me a reason to do it and I swear I will."