One day Kelvin's dad brought home a robot. The robot was special in that it could detect a lie and would slap the person who lied on the face. Kelvin returned late from school that day and his dad asked him, "Son why are you late from school?" Kelvin answered, "Dad, we had extra classes today". Much to his astonishment the robot jumped up and slapped Kelvin on his face. His dad told him, "Son this robot is special in that it can detect a lie and will then slap the person who lied. Now come on tell me the truth. Why are you late?" "Dad, I went to a movie" "Which movie?" "The Ten Commandments" Immediately, Kelvin got a slap on the face from the robot. "Sorry Dad, I went to see the movie Sex Queen". "Shame on you son, when I was your age I never watched obscene movies or misbehaved" Immediately, the dad gets a tight slap on the face from the robot. Hearing the last sentence, Kelvin's mother comes walking out of the kitchen and sarcastically says to her husband, "After all he is your son!!!" To which the robot steps up and gives Kelvin's mother a resounding slap too on her face!