This cartoon by Percy Leason (1889-1959), set in his fictional Australian country town of Wiregrass, would have appeared some time in the 1920s or 30s, but it still rings true.
The caption says:
BRAVE NEW WORLD - Back from the education conference with a head full of new ideas and enthusiasm.
(Click on image for bigger version.)
From Garrie Hutchinson, Wiregrass - A Mythical Australian Town: The Drawings of Percy Leason, 1986.