They come to me for my birthday with a friend. They smile mysteriously. I expect.

Son: (confidently begins, holding the envelope in his hands) - Father, congratulations! You have 47, so we decided to give you 47 cents of money.

I: (with false humility) - Yeah, you are what! Why so much?

Son: (with noticeable relief) - But we have not completed 40 so we only give 7 pieces!