Just now, happened something random, I haven't seen in videos or read about anywhere yet. My Sumatochi was chilling, and then my P's made a noise, when I looked it had letter, then it oppened and there was this big heart background, the card had cake picture on it, and sumatochi stood in center of it with hearts flying around and text "Happy Happy" . Then he said something (but since I don't know japanese, I have no idea what) the card closed and all was normal again.