‘The Greatest Pirate Story (N)ever Told!’

How do you describe a show whose script changes with every performance? A few reliable statements: Smooching, sword fighting and water spraying will occur. “Aaarr!” will be heard often. And, most important, it will provide more laughs than there are bones in Davy Jones’s locker. So it goes in this partly improvised hourlong family musical, created by Christopher Leidenfrost, in which a pirate crew is cursed by a sea witch and has to perform a Broadway-style spectacle to get its treasure. Revived for just this weekend, the show enlists young audience members to help write the scenes, in the style of the game Mad Libs.