Lie Detector

From Irene.

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John was a sales clerk's delight when it came to any kind of unusual gimmick. 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 5:30 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 two hours late getting home?," they asked.
"Several of us went to the library to work on an extra credit project," said Tommy.
The Robot then walked around the table and slapped Tommy, knocking him completely out of his chair.
"Son, this robot is a lie detector; now tell us where you went after school."
"We went to Bobby's house and watched a movie."
"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 lip quivering, Tommy got up, sat down and said, "I am sorry I lied. We really watched 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 then walked around to John and delivered a roundhouse right that nearly knocked him out of his chair. Marsha was bent double laughing, almost in tears.
"Boy, did you ever ask for that one! Moreover, you cannot be too mad with Tommy. After all, he is your son!"
The Robot immediately walked around to Marsha and slapped her three times.