Some more
McGonagall: Should I remind you that you are in a classroom?
Cho: Oh, Harry. He was soooo nice!!!! *shiuff*
Lockhart: Of course I knew that one!! Just seeing if you too knew it...
Crabbe and Goyle (with stupid faces

): Ummm... Errr... Hmm...
Binns (always with the same voice): In the year of 1768 some terrible catastrophe happened leading to... (he doesn't see thirty heads in front of him launching a lot of Zzzzzzzz

into the air....)
Malfoy

: You're lucky there are some teachers around here...