These sisters know how to have a good time Called habit-forming by "Maxim" and chosen as one of the Funniest Calendars on "The Ellen DeGeneres Show," "Nuns Having Fun" is the nostalgic bestseller that reveals the surprising side of convent life. Here are nuns on roller coasters. Nuns joyfully jumping rope. Nuns on Vespas. The hilarious captions are by Maureen Kelly and Jeffrey Stone, co-authors of the "New York Times" bestseller "Growing Up Catholic.""