A father bought a lie-detecting robot that slaps people if they lie.
At dinner that night, he asks his son if he did his homework. The son says "yes".
The robot slaps the son.
The father asks, "well, then what
did you do??"
Son: "We watched Star Wars"
The robot slaps the son again.
The father asks: "OK, what did you
really watch?"
The son admits it was a porno movie.
The father says "when I was your age, I would never have watched pornography".
The robot slaps the father.
The mother turns to the father and says "well, that's your boy alright".
The robot slaps the mother.