I have to admit a (now not-so) secret fondness for philosophy jokes. Many good links can be found here (David Chalmers offers many of the same, but several of his links appear to be broken). Here are some of my favourites...
Cause of death for philosophers:
Wittgenstein: Became the late Wittgenstein
Plato: Caved in
Moore: By his own hand, obviously
Marx: Capital punishment
Kripke: Went rigid
Jackson: Saw red
Heraclitus: Fell in the same river twice
Hare: Wrong prescription
Goodman: Gruesome bleen inflection
Bentham: Fell off his stilts
Why did the chicken cross the road?
Epicurus: For fun.
Einstein: Whether the chicken crossed the road or the road crossed the chicken depends upon your frame of reference.
Zeno: To prove it could never reach the other side.
And, the Non-philosopher's Guide to Philosophical Terms:
Layman - "somewhere between "crystal healing" and "tree hugging" in the Dewey decimal system"
Philosopher - "No! How many times do I have to tell you? Nothing whatever to do with this New Age stuff! Now move my book away from the stand containing Shirley MacLaine, or I shall be very upset."
Layman - "an angst-ridden statistician"
Philosopher - "a reversed E"
And, a few more definitions that I've thought up myself...
Layman - "losing control over one's bladder"
Philosopher - "losing control over one's passions (a.k.a. 'akrasia' or 'weakness of will')"
Layman - "a craving for more food"
Philosopher - "the preferences one has about one's other desires; commonly found in Frankfurt"
Layman - "A German city. Almost a sausage."
Philosopher - "A contemporary philosopher with little patience for Bullshit."
Layman - "One that is unrestrained, and always gives in to their second-order desires"
Philosopher - "A creature that lacks second-order desires. Not a person."
And, for a more serious one...
Begging the question:
Layman - "raising the question; leading on to the new problem"
Philosopher - "assuming what needs to be proved; leading back to the prior problem"
Any other suggestions?