I first read it as "never got farther than p" which also works, I think. And I do recall:There was a young curate of Kew
Who kept a tom cat in a pew;
He taught it to speak
But it never got farther than μ.
And, of course:There was a young curate of Kew
Whose limericks stopped at line two.
And needless to say, it's fine to learn a limerick that starts with "a young curate of Kew," and does not end by grossing you out.There was a young man from Verdun.