Odd coincidence...
I'm writing a fantasy RPG based on a book whose author made the mistake of putting a thing about her world's calendar on her web site but didn't say anything about leap years. So we've just been negotiating how often they happen, and yesterday ended up deciding on one every 82 years (about 60 years by Earth's calendar)... which is fine for the dragons who are the main characters, they live hundreds of years, but considered devastatingly unlucky for the humans of the world - their medicine is Victorian era, so if you're born on the leap day you'll probably never live to your first birthday.
