Little Johnny - Horsie Ride

          Little Johnny is passing his parents' bedroom in
      the middle of the night, in search of a glass of water.
      Hearing a lot of moaning  and thumping, he peeks in and
      catches his folks in The Act.  Before dad  can even react,
      Little Johnny exclaims "Oh, boy!  Horsie ride!  Daddy, can I
      ride on  your back?"
 
                Daddy, relieved that Johnny's not asking more
      uncomfortable questions, and seeing the opportunity not to
      break his stride, agrees.  Johnny hops on and daddy starts
      going to town.Pretty soon mommy starts moaning and gasping.
      Johnny cries out "Hang on tight, Daddy!  This is the part
      where me and the milkman usually  get bucked off!"