A man bought a lie detector robot that slapped those who were lying. His twelve years old son comes from school two hours later than usual.
“Where have you been until now ?”, father asked.
“I was at the libray to prepare a report.”
The robot comes up to him and gives him a slap across his cheek.
“Kid, this robot is a lie detector ! You would do better if you were telling the truth !”
“OK, I was to a friend and watched a movie… ‘The Ten Commendments’…”
The robot gives him another slap.
“Ouch, it hurts ! Well, it was actually a porn movie…”
“Shame on you ! When I was your age I never lied to my parents !”, said his father.
Bang ! The robot slapped the father.
Mother comes up to father and says:
“It’s clear he’s your son…”
Bang ! The robot gives her a slap across her cheek.