Grieved Story

Once upon a time there were four friends who were all staying together in a fifty-story hotel. One day, the power was out, and they had to go upstairs, all the way up fifty stories. As they walked up steps, they took turns telling stories. At the forty-seventh story it was the fourth man's turn to tell a story, and it had to be a grieved story. He said a single sentence: "We forgot our key downstairs."