since Hitler was a corporal

For a very long time. Hitler was thought to have served as a corporal in World War I, but historians have disputed this. Potentially offensive. What does Grandma mean when she says she's been teaching third grade since Hitler was a corporal?

See also: since

See also:

Eat me!
blanco
big white chief
gimpy
peg-leg
deaf as a post
(as) deaf as a post
be as deaf as a post
just gay enough
cakewalk

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