There once was an X from place B
Who satisfied predicate P
The X did thing A
In a specified way
Resulting in circumstance C.

@rgarner a few meta-limericks I enjoy but can't credit either:

There once was a girl named Sue
Whose limericks stopped at line two

There once was a man named Dunn

And lastly, the one about Nero

@jrm @rgarner

There was a young man from Japan
Who wrote verse that never would scan.
When they said "But the thing
Doesn't go with a swing,"
He said "Yes, but I always like to get as many syllables into the last line as I possibly can."

@jonberger @jrm @rgarner
Oh that's interesting, it's a variant of the version I know, which goes like this:

There was a young man from Japan
Whose poetry never would scan
When told this was so,
He answered, "I know,
But I always try to fit as many words into the last line as I possibly can."