A Family Bought A Machine That Beeps Everytime It Hears A Lie.

The son comes home from school.

"Did you get any grades today?" asks the mom.

"Yes, i got an A."...BEEP "Ok, i got an F" The son corrects himself.

The dad comes up to the son and says "Son, when I was your age, I was a straight A student"...BEEP

The mom then starts laughing and says "You guys have so much in common, i can already tell he is your son"...BEEP