The young marine had just finished boot camp and was home on leave at his parents farm in the bible belt of Iowa. He really stood out with his buzz haircut and his sharply pressed uniform, but even more noticeable was the colorful language he had picked up in the Marine Corps.
That night at dinner he turned to his mother and said "Could you pass the fucking butter?"
At this his mother clasped her hand over her mouth in disbelief, started crying and had to leave the table.
After dinner his father took him outside and had a talk with him. "I know you are all grown up now and that you are exposed to some pretty rough language from your buddies in the service, but this is Iowa and we don't talk like that here, so while you are home you had better clean up your act and not give your mother any more grief."
The next night at dinner, the young marine appologised to his mother for his bad language and said that he would really try and act better around them.
Later in the meal he turned to his mother and said "Pardon me mother, would you please pass the butter?"
Both parents beamed at the improvement.
Then the son grined and said "Thought I was going to fuck up didn't ya?"