The Belles of St. Trinian's (1954)
[an explosion has occured in the Chemistry room]
Miss Fritton: Oh dear. I told Bessie to be careful with that nitro-glycerine!
Arabella: Monica Drew wasn't expelled when she burnt down the gymnasium.
Miss Fritton: The gymnasium was insured! The sports pavilion was not.
Supt. Kemp-Bird: You wouldn't mind giving me the name of your phyciatrist, would you?
Manton Bassett: Delighted, old chap.
Miss Fritton: I cannot afford to have continual arson about in my school!