A married couple was using code msg trough their 6 year old child. When any one of them wants get couple with, they use him to convey msg to each other. Once the husband was in mood, he called his son and said: Ask your mother what colour of tape at her type writter, red or blue? Her wife was bussy in kitchen she told him: Tell dad it is red at this time. After some time when she was free she called her son and said: Tell your dad, now the tape became blue, ask him to come in my bed room.
The boy came back to her with his father's reply. Mom dad replied: The letter was urgent, so I posted it a hand written.