A man bought a Lie detector robot that slaps people who lie. He decided to test it at dinner: …  
DAD : Son where were you today during school hours?  
SON : At school (robot slaps the Son and he immediately changes his mind) Okay I went to the movies!  
DAD : Which one?  
SON : Harry Potter (robot slaps Son again!) Okay I was watching porno.  
DAD : What? When I was your age I didn’t even know porno! (robot slaps dad)  
MOM : hahahahaha! After all he is your Son! (robot gives Mum a hot dirty slap)