A dad buys lie detector robot that slaps people that lie. He decides to test it. "Son, where were you today?" Son says "at school dad." Robot slaps the son! "Ok, watched a dvd at my mates!" "What dvd?" "Toy story." Robot slaps the son again! "Ok, it was a porno" cries the son. "What! When I was your age I didn't know what porn was!" says dad. Robot slaps the dad. Mum laughs "Ha Ha! He's certainly your son!" Robot slaps the mum!!