Dave ran all the way home and used his key to unlock the door. When he opened the door, he realized that his house had slightly changed.
In the entrance there was a trophy case filled with trophies and awards for a high school runner. Dave walked past them and saw that his family pictures were different too.
In the first picture was his wife and a man Dave didn't know in a wedding photo. Down the hall, Dave saw them in photos with their first child and then their second child and the last large family portrait showed the man and wife with three children. A sixteen year old Dave with what appeared to be an older brother and a younger sister.
"The pen changed everything!" Dave said out loud to an empty house. Dave bolted upstairs to his room and looked around.
He reached out for a piece of paper and began to write something with the pen.