Leo Tolstoy opens Anna Karenina with, “Happy families are all alike; every unhappy family is unhappy in its own way.” And it’s true: when you see a family squabbling at Disneyland, there are any number of things that could have brought them to that particular moment. An affair? A recent miscarriage? Secret involvement in a drug cartel? A death in the family? An alcoholic older brother? But see a happy family at Disneyland, and your mind goes nowhere.