There is a mom and dad who live with their son.
The Father is obsessed with buying wierd items. One day he buys a lie detecting robot. The same day, his son comes home from school at about 6 in the evening.
The dad asks him "Son, where have you been?"
Son says "Oh me and some of the guys went to the library to study for a test."
The robot goes over to the son, slaps him out of the chair onto the floor.
Father says "Now son this is a lie detecting robot. Where did you really go after school?"
The son says"We went to Jimmy's house to watch a movie"
Father: "What movie?"
Son: "Snow White"
The robot goes over to the son, slaps him out of the chair onto the floor.
Son says "ok ok, we were watching Sex Raiders 5."