But I really prefer the clean ones !! Viz--

    The chief stewardess of a Boeing,
    When asked "Which way are we going ? "
      Said " Our navigator
      Is joining us later--
    'til then, we have no way of knowing ! "

         OR-

    A silly young fellow from Yuma ,
    Told an "Elephant Joke" to a puma--
       Now his skeleton lies
       Under hot desert skies.
    ( The puma had no sense of huma )