Dad brought robot which slaps a person who lies!

Dad: son, wher wer u?
Son: school!
Robot slaps...

Son: film
Dad: which one?
Son: Sai baba!
Robot slaps again!

Son: Blue film
Dad: What? I ve never seen such films.
Robot slaps dad...

Mom: Forgive him dear, after all he is ur son.
Robot slaps mom!