The lie detector robot

A dad buys a lie detector robot that slaps a person if they were lying.

Dad: Son, where were you during school hours?

Son: At school.

The robot slaps the son.

Son: Okay I was watching The Secret Life of Pets!

The robot slaps his son again.

Son: Okay I was watching violent movies!

Dad: What?! When I was your age I never watched those kinds of movies!

The robot slaps the dad.

Mum: Haha, after all, he is your son…

The robot slaps the mom.

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