A man buys a lie detector robot that slaps people who lie. So he decides to try it out at dinner.
Dad: Son, where were you today during school?
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 P*rn Star.
Dad: What?! When I was your age, I didn’t even know what p*rn was. *Robot slaps dad*
Mom: Haha!! Like father like son. After all he is your son, *Robot slaps mom*