A man buys a lie detector robot that slaps people who lie. He decides to test it at dinner.
Dad: Son, where were you today during school hours?
Son: At school.
The robot slaps the son.
Son: Ok! I watched a DVD at my mates.
Dad: Which one?
Son: Kung Fu Panda
The robot slaps the son again.
Son: Ok! It was a Porno.
Dad: WHAT? When I was your age I didnít even know what porn was!
The robot slaps the Dad.
Mom: Hahahahaha! After all heís your son.
The robot slaps the mom.