"'I have no idea,' said Snape coldly. 'Potter, when I want nonsense shouted at me I shall give you a Babbling Beverage. And Crabbe, loosen your hold a little. If Longbottom suffocates it will mean a lot of tedious paperwork and I am afraid I shall have to mention it on your reference if ever you apply for a job.'" (p.657, UK version) The sarcasm!
And
"'Thank you so much, Professor!' said Professor Flitwick in his squeaky little voice. 'I could have got rid of the sparklers myself, of course, but I wasn't sure whether or not I had the authority.'
Beaming, he closed his classroom door in her snarling face." (p. 558, UK version)
And, yes, of course, so many of the things others have mentioned!
Here via the daily_snitch
And
"'Thank you so much, Professor!' said Professor Flitwick in his squeaky little voice. 'I could have got rid of the sparklers myself, of course, but I wasn't sure whether or not I had the authority.'
Beaming, he closed his classroom door in her snarling face." (p. 558, UK version)
And, yes, of course, so many of the things others have mentioned!