A good story, from a friend.
A child is playing football in the school playground. He really wants the ball. He really wants it, even more, and shouts "pass me the fucking ball". A classmate threatens to tell his teacher of his swearing.
All day, his classmate keeps making knowing looks at him, putting up his hand in class, but then saying something different.
His nerves mangled, he decides that he is going to have to bring this to an end and asks to see the headteacher at the end of the day.
"I know I shouldn't have done it, Miss, but you see I'm from a swearing background."