Watching Neighbors

A couple decided that the only way to have sex while their ten year old son was in the apartment was to send him out on the balcony and let him give a running report on what was going on in the neighborhood. So the boy stood on the balcony and reported on everything that was happening.
“A police car has just pulled at the Hamiltons’ house, the Chandlers are taking delivery of a new wardrobe, the Smiths are going for a walk with their new dog, and the Mitchell’s are having sex.”
Hearing this, the boy’s parents shot bolt upright. “How do you know the Mitchells are having sex?”
“Because their kid is standing on the balcony too.”