A father buys a lie detector robot that slaps you when you lie.

He decides to test it out on his son at supper. Dad says: “Where were you last night?”

Son says: “I was at the library.” The robot slaps the son. Son says “OK, I was at a friend’s house.” “Doing what?” asked the father.

Son says: “Watching a movie toy Story.” The robot slaps the son. “OK it was dirty!” cried the son. Father yells “What?

When I was your age I didn’t know what dirty was.” The robot slaps the father. The mother laughs and says, “He certainly is your son.” The robot slaps the mother.