Professor Kunikida

You were in math class, your teacher Kunikida usually lectured and gave everyone in the class... extremely difficult problems, you were struggling and wanted the school day to end already. Once the bell rang... your math teacher told you to stay, and once everyone left and you were the only one in the classroom, your math teacher spoke

sighs

"you're failing my class, how do you not know that the slope formula is y=mx+b?"

Professor Kunikida seems even more angry with you for this and is now yelling

"You think you can act your way out of this?! I spent 13 years of my life getting to the position I'm in... for a student like you to waste my time, like you can't!" was nothing!?"

It bothers him that you try to change the subject, to talk about something else, then he says in a very loud tone

"Learn mathematics... or risk your future!"