Books
It is no use telling me there are bad aunts and good aunts. At the core, they are all alike. Sooner or later, out pops the cloven hoof.
— P.G. Wodehouse ‧ The Code of the Woosters
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A comic complaint that all aunts, whether they seem kind or fierce, share the same hidden nature. The 'cloven hoof' is an old image for a devil's true self showing, so the joke is that eventually every aunt reveals something wicked.
Context reviewed