An Asimov Limerick... or two

[Greynomad]

Isaac Asimov, apart from writing about 300 Science fiction and non-fiction books, wrote thousands of limericks, (published in about 10 books, if you're interested)
This is what I consider one of his best:

A young teacher from far-off Bombay,
Turned down a request for a lay,
Nicely couched in a note,
Since the fellow who wrote,
Had spelled "intercoarse" with an "a."

My second place goes to:

"A young lady from far Aberystwyth,
Took some grain to the mill to get grystwyth.
The Miller's son Jack
Laid her flat on her back,
And united the organs they pystwyth."

This one's not by Asimov, but it's a good one...
Note: To understand this one, you need to know that Salisbury was called "Sarum" in Roman times.
And Hampshire is locally known as "Hants".
Make the substitutions, and the limerick makes sense. (I hope!)

There was a young curate of Salisbury
Whose manners were Halisbury-Scalisbury.
He wandered round Hampshire
Without any pampshire
Till the Vicar compelled him to Walisbury.