ARE YOU A HILLBILLY?

Three third-grade boys are playing at recess in school.  The three friends run out of games to play.  Finally, the Jewish third-grader said, “ Let us see which one of has the largest “willy wacker” ”.  He pulls his out and the Catholic third-grader says, “That is nothing, and pulls out his “Johnson” which is slightly thicker and longer”.  The Hillbilly third-grader astonishes both of his friends when he pulls out his which is longer and thicker!  The Jewish and Catholic boys tell him that his is bigger because he is a Hillbilly.
That evening at home the mother of the Hillbilly third-grader asks him about school that day.  He tells her about the game that he and his two friends did at recess.  He asks his Mom if his is bigger because he is a Hillbilly.  She states,
“No, son it is because you are 18 years old!!!”