My physics teacher used to say: what you have written is very good, but be kind enough to wipe this down (if sb was doing a task on the blackboard). I also know a teacher who says to random people : you are going to get bad mark today, so at least behave ! (at the very beginning of the lesson ).
Also, my geography teacher pronounces all the important words in such a funny way that I will remember them forever. That is why I have the best possible mark in geography.
My former literature teacher often had this expression: "Mondo gatto" ("cat world"). We still tease her about it even now that we finished school 9 years ago!