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A father buys a lie detector robot that slaps people when they lie. He decides to test it out at dinner one night. The father asks his son what he did that day.
The son says, "I did some schoolwork."
The son says, "Ok, ok. I was at a friend's house watching movies."
Dad asks, "What movie did you watch ?"
Son says, "Toy Story."
The robot slaps the son.
Son says, "Ok, ok, we were watching porn."
Dad says, "What?
At your age I didn't even know what porn was."
The robot slaps the father.
Mom says, "Well he’s certainly your son ."
The robot slaps the mother.
End of Story: Robot For Sale.