Since you mentioned little johnny in your previous thread:
Little Johnny was walking along a railroad track one day and his neighbor called to him saying " Get away from those tracks Johnny or else a train will come along and blow you away". Johnny yelled back, "c'mon train"!!
It was the first day of school and the teacher asked the class to report on how their summer went. Johnny stood up and said "one day my dog was on the railroad tracks and a train came along and ran over his a$$". The teacher replied, "now Johnny, dont you mean his rectum?" Johnny said, " wrecked him hell, it killed him".