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! Horsy 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!"