A boy was teaching a girl arithmetic, claiming it was his mission.
He kissed her once, then twice, and said, "Now that's addition."
In silent satisfaction, she sweetly returned the kisses and said, "Now that's subtraction."
Then he kissed her, she kissed him, without an explanation. Together they smiled and said, "That's multiplication."
Suddenly, her dad appeared on the scene and made a quick decision. He kicked the boy three blocks away and declared, "That's long division!"