I was beginning to puke reading that thread: "Oh, we have 467 people all singing in our barn, and the villagers have a tradition of tugging their forelocks at our dcs, all clad in their Boden pyjamas..."
Anyway, my worst Christmas was after my father died. My mother cancelled Christmas, stayed in bed and refused to participate. I sat downstairs with a bottle of Iceland wine (everywhere else was closed by the time I came home from work on Christmas Eve) and watched Casualty, in which most people were killed in unfestive pile-ups.