It's rude to talk about people behind their back.
Pat overhears two kids in his class talking about an old friend of his.
Pat wants to join in on the conversation.
Pat talks about his friend with the kids, and then calls his friend to tell him he just talked about him.
Pat joins the conversation and tells them some rumors he has heard.
Pat's friend is happy that Pat didn't gossip about him behind his back.
Pat's friend would be betrayed if he found out that Pat talked about him.