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Huck Finn, a truly perceptive gentleman from the midwest, sent this one...

John was a salesman's delight when it came to any kind of unusual gimmicks. His
wife, Marsha, had long ago given up trying to get him to change.

One day John came home with another one of his unusual purchases. It was a robot
that John claimed was actually a lie detector.

It was about 4:30 that afternoon when Tommy, their 11 year old son, returned home
from school. Tommy was over two hours late.

"Where have you been? Why are you over 2 hours late getting home?" asked John.

"Several of us went to the library to work on an extra credit project," said Tommy.

The robot walked around the table and slapped Tommy, knocking him completely out
of his chair.

"Son," said John, "this robot is a lie detector, now please tell us where you really were
after school."

"We went to Bobby's house and watched a movie." said Tommy.

"What did you watch?" asked Marsha.

"The Ten Commandments." answered Tommy.

The robot went around to Tommy and once again slapped him, knocking him off his chair.

With his lip quivering, Tommy got up, sat down and said, "I am sorry I lied. What we
really watched was a tape called Sex Queen."

"I am ashamed of you son," said John. "When I was your age, I never lied to my parents."

The robot walked around to John and delivered a whack that nearly knocked him right out
of his chair.

Marsha doubled over in laughter, almost in tears and said, "Boy, did you ever ask for that
one! You can't be too mad with Tommy. After all, he is your son!"

The robot walked around to Marsha and knocked her out of her chair.