"Don't forget our algorithm: *insert math algorithm here*"
That's what my math teacher always says.
There's also this adult teacher helper person lady. Half the people hate her, the other half are scared of her. Math teacher says, "Copy this down," and 10 seconds later she says, "copy this down." And she doesn't double-check before telling people something, causing the actual teacher to come up to them and ask them why they don't have something out, written, or why they aren't on the right page or in the right spot, etc.
I once had a history teacher that had a certain word he would use a lot. I can't remember what word that was. I remember that classmates would also say that word sometimes.
Oh, back in middle school, I was in science class and the substitute security guard (yeah, that may sound odd.) walked by and sang "I don't know what I've been told!". Then my science teacher sang "You are disturbing my class!" and then shut her door.
(I wish I could describe how it sounded when my science teacher sang that. It was hilarious.)
My photography teacher used to sing Grace Kelly by Mika a lot. This was back around the time it was released of course, I haven't been in school for four years.