Laughing Limerick Forum Lords of Limerick

There are a great many people who are renown for their way with a limerick.  Who's your favorite?

I suppose it's no actual secret that I love Isaac Asimov's limericks.  After all, I hosted a contest with that theme.

Susan

Asimov is also one of the top writers of that genre where you write a story and the final line is a take off on some famous line like, "I can't believe I ate the hole thing." or "Jack and Phil went up the Jill to catch a sale of slaughter." (OK, that was grim) 

Can anyone remember what that particular piece of fun is called?
Susan S