Lie detector robot.

A man buys a lie detector robot which slaps people who lie. He decides 2 test it @ dinner. Dad: Son, where were u today during school hours? SON: at School. Robot slaps son! Ok,I lied, I went to the movies. DAD: Which one? ... SON: Toy Story. Robot slaps son again! Ok, it was Bedroom Eyes. DAD: When I was ur age, I didn't even know what films were.. Robot slaps Dad! MOM: Ha ha! After all he's ur son. Robot slaps mom...! Total Silence... =))