There’s a pair of jokes David Thomas likes to tell when he talks about the theory of fun. “A horse walks into a bar,” the first joke goes, “and the bartender says, ‘Why the long face?’ “ “A duck walks ...

Judy Przystup has this grand vision of her house at Christmastime. She’s sitting at the piano surrounded by her family. She’s playing Christmas songs and they’re all singing together, so happy. Linda ...