Did you see the article in yesterday’s New York Times on puns?
http://www.nytimes.com/2009/03/28/opinion/28Tartakovsky.html?_r=1&scp=1&sq=Pun&st=cse
One is worthy of mention, credited to The Most Reverend Richard Whatney, Archbishop of Dublin.
What did the Jews eat while wandering the desert?
The sand which was there.
There were no sandwiches in the desert.
But remember, Moses brought forth Ham
and his descendants mustered and bred.