There are many.. Many types of teachers..
Yao: alright class, good morning to you. Hope you rested well we have a test today!
Alfred: alright so you have the allies England, France, Russia, China and.. THE BEST GOD DAMN NATION TO EVER GRACE THIS PLANET. America ~ fighting the totally bad guys Axis which consisted of Germany, Italy, Japan.. Blah, blah, blah.. Allies won.
Xiao: don't do drugs.. It fuck you up, it fuck you up real good *injects himself with freaking heroin* what? This isn't a drug.. You saw nothing.
Allen: *glares at student* its always the little shits like you that never go missing
Ashlyn: *writing shit on the board* boom, get to it. Have fun~ have any questions raise your hand.
Zhu: no talking, no bathroom breaks, no snacking, no drinks, no texting.. And finally there will be no "noticing" in my premises! That goes especially for the sempai's
Amelia: *sees what's being served in the cafeteria* thank fuck I don't have to eat that crap! Poor students.. *pulls out her lunch-box*
Chun: *sighs* No.. No I'm not a student. I may be short but I can still teach!