The Robot (joke I Heard From A Friend)

In the future, this one family has a robot which would slap them every time they lie, to keep them straight. The boy is talking to the robot. "How was school today?" The robot asked "It was fine, I guess" the boy replied. The robot slapped him. "Alright, I wasn't at school, I was hanging with one of my friends. We weren't doing much, anyways" The boy gets slapped again. "Fine, we drank a little" The boy's parents comes in, ready to scold him. "Young man, when I was your age, I stayed away from that stuff. I didn't even know what it was!" The father gets slapped by the robot. The mom says "Honey, you really need to get him to stop these habits, he is your son after all!" The mom got slapped by the robot