In English, there are various humorous poems about grammar and spelling. In order to humor, or perhaps annoy, a poetry-focussed French teacher at my daughter's college, I wonder if there are any famous examples of this species in French?
Je propose la très jolie Harmonie imitative de la langue française, d'Antoine-Pierre-Augustin de Piis comme un premier exemple en appelant d'autres...
A friend supplied links to a love poem via an allegory on grammar:
and a page of poems about punctuation.
I'm still hoping for something along the same lines about the passé composé.