From Beak to Tail:

A Few Headmasters
headmaster
Mr Wesson thinks it's the ball-cock, Mrs Gordon thinks it's the shuttle-pan. But I think it's you boys in fact I'm sure of it.
headmaster
Come on, St Custard's!
headmaster
That one, Postlethwaite, would have bowled Bradman.
headmaster
Unless the culprit owns up the whole school will dig the vegetable garden.
headmaster
This is not going to hurt me as much as it hurts you.
headmaster
He's holding up the whole side is Dick 2.