Man
A man buys a lie detecting robot that slaps people when they lie.
He decides to test it at dinner one night. He asks his son what he did that afternoon. Son: "I did some homework." The robot slaps the son. Son: "Ok, ok. I was at a friend's house watching a movie." Dad: "What movie did you watch?" Son: "Toy Story." The robot slaps the son. Son: "Ok, ok, we were watching porn." Dad: "What? At your age I didn't even know what porn was." The robot slaps the father. Mom: "Well, at least this isn't a repost." The robot slaps the mother.