"Salesman" joke

As a door-to-door salesman approached a house on his route, he saw a small boy sitting on the porch reading a book.

"Hi, sonny," he said. "Is your Mommy home?"

"Yes, sir," the boy replied, and went back to reading.

The salesman rang the doorbell several times, then resorted to knocking on the door. After 15 minutes of this with no response, he turned to the boy.

"Hey, sonny," he said, "I thought you told me your Mommy was home."

"I did, Mister," the boy replied, "As a matter of fact, I see her watching you right now from our living room window across the street."