it's my life

In the class room, the teacher asks. "Who destroyed Berlin's wall?"
No one of her student can answer this question. They all keep silent. Then the teacher turns her face to Little Johnny. "Johnny ?"
"No, I didn't !!!!" exclaimed Little Johnny.
"How rude you are to answer me like that !" The teacher then writes a letter to Little Johnny's father and asks him to come to her office to discuss his son's behavior.
The next morning, Little Johnny's father comes and meets the teacher in her office. The teacher tells the story to Johnny's father but to your surprise, Johnny's father responds like this : "Well, if he was the one, he would honestly tell so!"