[Your arm has now been claimed as Red Chocobo territory, Dave. He is boldly going where no chick has gone before! Just... gonna... struggle up to your shoulder...]

Well, I don't know about the ceiling, but if you suddenly start getting divebombed by him jumping down from tall bookshelves, don't be alarmed. It's all fun and games until they get to the size of a dog, and then it's just kind of accidental concussion territory.