because she couldn't control her pupils
Because I said so.
They can't control their pupils.
Mister bus
Headmaster: I've had complaints about you, Johnny, from all your teachers. What have you been doing? Johnny: Nothing, sir. Headmaster: Exactly.
Pupil: You told me to put it in the Net.
Pupil: Smiles - because there is a mile between the first and last letters
