Because it is an entire life's drama in one episode and sometimes there are three. It's always the same scenario, but they're always different people. So you ge

Because it is an entire life's drama in one episode and sometimes there are three. It's always the same scenario, but they're always different people. So you get to know them very well by how they react to the news. They are real life stories, no one knows what is inside the envelope and we are all in it together wondering what it will say. It allows us to experiment with our human reading skills. Do the individuals know themselves as well as we know them. Is she honest when she says it could /only/ be him? Is he honest when he says he knows it isn't him. The amount of shock at the result is illustrative of the idea that the world around us can be exactly the opposite of what we believe it to be -- or want it to be.