A man buys a lie detector robot that slaps people that lie. He decides to test it at dinner.
DAD: Son, where were you today during school hours?
SON: At school
*Robot slaps son*
SON: OK, I went to the movies
DAD: Which one?
SON: Toy Story
*Robot slaps son again*
SON: OK, It was a Day With A Porn Star.
DAD: WHAT? When I was your age I didn't even know what porn was!
*Robot slaps Dad*
MOM: HAHA! After all he's your son.
*Robot slaps mom*