With all the moping with Amy and Rory leaving and all the 'You shouldn't be alone' babble, I kept thinking 'Man, the Doctor has had about three dozen companions and met another dozen people who would have wanted to go with him.
Would have loved that instead of going into self imposed exile, if Matt Smith's Doctor had gone to visit a past companion.
Be cool if the Christmas special had taken place with Doctor 11 and an older Jamie, or Jo Grant or Tegan.