Funny Dirty Joke

Anant bought a Lie detector robot that slaps people who lie. He decided to test it at his redneck neighbours: …
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)
MUM : hahahahaha! After all he is your Son! (robot gives Mum a hot dirty slap)