He only had one pupil.
Ventriloquists have to be able to speak with their mouths closed. Politicians speak out of both sides of their mouths simultaneously.
Closed for Winter".
Not only have you let me down, you've let yourself down, and you've let the whole school down!
He wanted to go to high school.
Pupil: I made it into a paper plane and someone hijacked it.
Pupil: I expect it's around Hadrian's garden miss!
He had only one pupil.
Because he only had one pupil! The joke is that I have no friends