Reminds me of a science teacher I once had, I'd just moved into a new school and it was my first science lesson- ergo, I wasn't on the register. I told the teacher 'Sir, I'm new here.'
He responded, 'Are you having a trial day?'
I answered , 'No, I'm staying."
He asked "So you'll be staying here forever?"
To which I answered "Well, I'll be going home at the end of the day." (Come on, he left himself open for that one)
The bloody twat then landed me with a detention and a trip to my head of year for 'insulting behaviour'. Arsehat.