Gravity Falls is the Disney animated television series that has inspired a cult following. Even though the show ended in 2016, there's still more fun to be had with Gravity Falls Mad Libs Our Mad Libs joins a very exclusive collection of merchandise available to fans, so make sure to get your hands on one of these books while they're still available. You'll get to know Dipper, Mabel, and all the strange residents of Gravity Falls in a whole new way by filling in the blanks inside this mysterious book