Jenny and Joanna love their imaginative and exciting grandmother. It's hard to guess what Grandma is going to do next. But this time, when the old lady arrives to take them to an outing, Jenny and Joanna are really puzzled. Their parents protest. It's a school day What could be more important than school? But Grandma won't take no for an answer. And with the promise, "Just this once," she whisks them off to Yankee Stadium for an unforgettable...