"Well it may have escaped your notice, but life isn't fair"

"Has it ever crossed your brilliant mind that I don't want to do this anymore?"

"Turn to page 394"

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

"That is the second time you have spoken out of turn, Miss Granger. Five more points from Gryffindor for being an insufferable know-it-all"

"Listen to you two, quarreling like an old married couple"

"Yes, it in easy to see that nearly six years of magical education have not been wasted on you, Potter. 'Ghosts are transparent"

"Always"