He had only one pupil.
Because he didn't get arrays.
Vaporeon
Pupil: Up and down or across Teacher: What do you mean Pupil: Well up and down makes a 3 or across the middle leaves a 0!
Pupil: Smiles - because there is a mile between the first and last letters
A tutor
They havent been taught good table manners!
Because he only had one pupil! The joke is that I have no friends