There are about 50 limericks in my notebooks, nearly all of them offhand and occasional. Here’s half a dozen to give you the idea.
     

WRITER’S BLOCK

When I’m sent to the block, Ralegh said,
will I really and truly be dead?
     Is the axeman the end?
     or when wanting a friend
can I sit here and talk to my head?

      2002
 

Upon the Famous
ROUNDBALL MATCH
recently play’d at LONDON

What a Spectacle! Top of the Pole!
And CHELSEA so bold, on the whole!
     with Thrills and Sensations
     and swift Penetrations
and ARSENAL with SEAMAN in Goal!

      2002
 

If you haven’t seen the SF classic The Day the Earth Stood Still then this may even less sense than usual.

KLAATU

‘Klaatu, you’re so hard and so taut!’
she cried, ‘You’re just perfect, old sport!
     Though, why do you grind
     every time from behind?’
‘Well, it’s actually me,’ murmured Gort.

      2002
 

This was written for a Challenge (What words of consolation can you offer an aborted foetus?) and won me my only MID in Pffa -

FOETUS

Now, foetus, no need to act surly -
just give us a smile, sweet and pearly.
     As we all must, my friend,
     you have reached the far end
and won gold stars for getting there early.

      2004
 

From NaPo 2006, where some deemed at least one cat poem compulsory -

CAT POEM

You want French? If you know where you’re at,
the puss, in that tongue, is a chatte;
     but to finish this lay,
     when the vice is anglais
then a flail o’ nine tail is a cat.

      2006
 

THE RICH

The rich on us all love to trample
made bold by their bill-i-ons ample;
     but hard as they try
     there are things they can't buy
and one day I may find an example.

      2006