The episode when Doug and Carrie are taking a night class with Spence. During this episode Carrie wants to sit on the couch with Doug and read their book. Doug comes in the room with his supplies and starts making jokes about is book light. When he first sits down he clearly already has the book with him. Then when the camera angle changes he is holding less stuff with the book missing. So he runs upstairs to get the book he just barely had in his hands. Spooky.