Here it is, as promised, a day early so you can practice this fine joke before tomorrow.
The Only Irish Joke I Know, Told But Once A Year
QUESTION: Why did the Irishman only put 239 beans in his bean soup?
ANSWER (in best Irish brogue): Because he didn't want it to be too-farty.
Thank you, and keep those Limericks comin'!
*Thanks to Brian Wilson, who told me this joke.