It seemed as soon as the word 'surprise' had came out of my mouth, Sans was back in the kitchen. I had told Mom to pack an extra pancake in case anyone other than Sans and Papyrus was in their house. As soon as I took all 3 of the pancakes out of the bag, I heard all of their stomachs growl. After they had ate the pancakes, Sans said bye to Undyne and Papyrus. They were heading off to train. 

 As soon as I shut the door, Sans was gone. I guess he had teleported to his room. I decided to head home.  As I was walking home, I saw something that I would never forget.