From the फिल्में (talking to Harry about Dumbledore leaving over the holidays in the 6th)" "[...] आप see, he's traveling and he won't return until term . . . resumes." Harry: "Traveling? Where?" Snape: Walks away.
Haha, okay, so it wasn't exactly a quote, but still :p
From the पुस्तकें (when talking to Sirius in OotP):"Or are आप afraid he might not take the सलाह of a man who has been hiding inside his mother's house for six months very seriously?"
Or, I really like this one; "Oh, very good," interrupted Snape, his lip curling. "Yes, it is easy to see that nearly six years of magical education have not been wasted on you, Potter. 'Ghosts are transparant.'"
aaaaand another quote from the king of sarcasm -
"Fascinating though your social life undoubtedly is, Miss Granger, I must ask आप not to discuss it in my class. Ten points from Gryffindor."
The whole Potion speech in PS, book and movie alike.
CoS movie : "Perhaps it would be और prudent to first teach the students to block unfriendly spells... (little smirk to Lockhart) Professor."
PoA movie : "Vengeance is sweet !" and "Give me a reason. Give me a reason and I'll do it !"
GoF movie : "Perhaps, we should, for the time being... let them... unfold." and "Don't. Lie. To. Me !"
OotP movie : "Your father was a swine !" and "Get. Out."
HBP book : "Don't. Call. Me. A. Coward !" and "Oh, very good," interrupted Snape, his lip curling. "Yes, it is easy to see that nearly six years of magical education have not been wasted on you, Potter. 'Ghosts are transparent.'"
HBP movie : during the Unbreakable Vow : "Put it down, Bella. We mustn't touch what isn't ours." I felt all weird, his voice was dripping with possessiveness and I could not help thinking this was indeed a psychological trait of his. (I want to be his ! I want to be his !)
I realize I'm in प्यार with the way Alan कहा all these words. His voice... his pauses... his silences... it's incredible how much Alan can make his characters say a lot in pauses and silence. He has eloquent silences.