When a kitten (or a cat) has a mistake it is only fair that all the older members of the household (those over say 10) participate in cleaning up after the kittens. After all everyone wanted the kittens and it was agreed in advance that any mess would not always be mum's responsibility. The list on the wall did not work that well, hence, we are going into the 21st Century with a league table. For now it just says thank you, but at a later stage it will also keep a little list and feed back to Santa Clause in the compilation of the naughty and nice list using the new NN Api.