When the two of them go to the arcade to play, they run into a stationary shop and find Nemo and Nemo's sister. Nemo runs off to check on his little sister, and when he finds her, he's so angry that he stomps on her. He's not angry at his sister for running away, but he is angry at himself for being the only kid he has left. He runs away as fast as he can, and his mom cleans up his room in case he comes back after running away.