Professor Snape: You were seen! By no less than seven Muggles! Do you have any idea how serious this is? You have risked the exposure of our world! Not to mention the damage you inflicted on Whomping Willow, that's been on these grounds since before you were born! Ron: Honestly, Professor Snape, I think it did more damage to us. Professor Snape: Silence! I assure you that were you in Slytherin and your fate rested with me, the both of you would be on the train home TONIGHT!
Professor Severus Snape: There will be no foolish wand-waving or silly incantations in this class. As such, I don't expect many of you to appreciate the subtle science and exact art that is potion-making. However, for those select few... [stares at Draco Malfoy] Professor Severus Snape: Who possess, the predisposition... I can teach you how to bewitch the mind and ensnare the senses. I can tell you how to bottle fame, brew glory, and even put a stopper in death. [notices Harry scribbling on his paper] Professor Severus Snape: Then again, maybe some of you have come to Hogwarts in possession of abilities so formidable that you feel confident enough to NOT-PAY-ATTENTION. [steps over to Harry] Professor Severus Snape: Mister Potter. Our new... celebrity.