Elevators

One day, an Amish boy and his father were visiting the city. While looking for a restroom, in the lobby of an office building, they were amazed upon seeing two shiny, silver walls that would part and then close back together again.
The boy asked his father, "What is this, Father?"
The father responded "Son, I have never seen anything like this in my life. I don't know what it is."
While the boy and his father watched wide-eyed, an old lady in a wheel chair rolled up to the moving walls and pressed a button. The walls opened and the lady rolled between them. The walls closed, swallowing her up, and the boy and his father looked on, while small numbered circle above the walls lit up. After a few moments, the circles began to light up, in reverse order. The walls opened up again, and a beautiful young woman stepped out.
The father turned to his son and said, "Boy, Go get your mother."