My favourite Christmas special is "Muppet Family Christmas". where the muppet gang, the Sesame Street gang and even the fraggles are all at Fozzie's mom's farmhouse. Great part is when the Swedish Chef is going to try to cook Big Bird, but then when they become friends, he instead decides to make "Shredded wheat, and cranberry sauce, MY ABSOLUTE FAVOURITE!!" (Big Bird says that). See it if you haven't!