Father: Ping pong is our national ball. No county can beyond us in playing Ping pong.
Son:Sometimes I am like a Ping pong.I am beaten by you when making mistakes.
Father: Yes, When you are beaten by one, it is called table tennis singles. When you are beaten by both of us, it's called table tennis doubles.
Mother: Though you are punished by both of us, which has never happened, what you said are funny.
