There are so many good ones to choose from.
"Is your father home?" he asked.
"No," she said, "but I'm the best piece in Westphalia!"
[Har-de-har-har. Snort. Slap knee.]
I've just found a new one, just by Googling "joke westphalia": here's the link and relevant passage:
http://www.aijac.org.au/review/2005/30-1/larouche_301.html
To prevent catastrophic, perpetual, worldwide religious warfare the ultimate clash of civilisations LaRouche demands that Bush adopt the LaRouche Doctrine for Southwest Asia. Listening to his rambling talk, it is difficult to make out just what the LaRouche Doctrine for Southwest Asia is except that it apparently "follows precisely the guidelines of the 1648 Treaty of Westphalia."
Oh, it's the way he tells 'em... :-)