Bruce Sterling's posted a compendium of "why did the chicken cross the road?" jokes on Wired.com. His twist? It's an Iraqi chicken so everything's got a logistics-of-conflict bent in this list of answers based on various points-of-view.
My favorite of them all (showing my love of linguistics) is: "Translators: Chicken he cross street because bad she tangle regulation. Future chicken table against my request.
There's something on the list sure to amuse everyone (set your political correctness threshold on high) so read and cluck and chuckle