What do you call your teacher if he/she has a weird name?

I had a teacher named Mrs Mallam. We called her Mrs Mallow, short for Mrs Marshmellow (she indeed looked like one). I also had a teacher named Mr Roche and we called him Mr Cockroach XD

we have a teacher named Andris, but we dont give him wierd names. some of my classmates do. they call him Andritt (Dritt means: you know when something smels) its a typical not so nice norwgian word

Ratface.

My LA teacher this taon is named Mrs. Boosinger,
We all just call her Mrs. Boo :3

We used to have an art teacher named Ms. McKnutz but everyone called her Ms. Nuts behind her back. It was quite amusing to see the look she would give people who called her Mrs. Nuts without thinking xD

My Science Teacher is Ms.Fishpaw But I don't call her weird names other Guys in my class called Fishpaw Ross and other weird names they called her!!

Mr./Ms. <Insert first letter of their last name>