Before dad can even react, Little Johnny exclaims, "Oh boy! Horsie ride! Daddy can I ride on your back?"
Daddy was relieved that Johnny's not asking more uncomfortable questions, and seeing the opportunity not to break his stride, he 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!"