One day Bill and Mary were sitting in their apartment when they decided that the only way they could have sex on a Sunday afternoon was to send their ten year old son, Johnny, out onto the balcony and report on the neighbourhood activities.
While little Johnny was shouting out what was happening in the neighbourhood, his parents jumped on each other and went hard at it.
"There's a car being towed away from the parking lot," Johnny shouted to his parents, "an ambulance has just gone by." A few moments passed and then Johnny said, "The Andersons have company. And the Cooper's are having sex."
Bill sat upright and shouted back, "How do you know that son?"