One day Santa's dad bought a robot.The robot was special in that it could detect a lie and would slap the person who lied on the face...

Santa returned late from school that day and his dad asked him, "Son why are you late from school?"

Santa answered, "Dad we had extra classes today".
Much to his astonishment the Robot jumped up and slapped Santa on his face

His dad told him "Beta,This robot is special in that he 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 for a movie", " Which movie?" "The Ten Commandments",
Smack
Santa got a tight slap on the face from the robot.

"Sorry dad honestly I went for the movie Sleaze Queen"

Dad: "Shame on you son when I was your age I never used to do such shameful things."
Smack
Dad gets a tight slap on the face from the robot.

Hearing all this,Santa's mother comes walking out of the kitchen saying,
"After all he is your son.......", to which the robot steps up and gives sharp slap on Santa's mother's face