When I was a kid, my parents had a dog that was already getting up there in years, named Arthur. At some point it was explained to me that he was moving slowly and getting tired more quickly because of his arthritis.

I thought my dad was saying ‘Arthur-itis,’ as a way of saying the dog was getting old and frail. I discovered my mistake when we were at my grandmother’s and I blamed her taking an hour to get ready to go out for dinner on her ‘Nana-itis’