And something actually made for Christmas! I put this together pretty quick while listening to the Doctor Who Series 6 soundtrack.
I even constructed this whole elaborate story for why Tati and Robyn are playing Santa and elf-compatriot. Santa Claus actually is real, with St. Nicholas being recruited by the big governing body of the universe to give kids toys and promote happiness and well-being. And when Robyn hears about this, she's all "Nah that's bollocks" and Tati's like "lawl I'm going to set you right".
"Well then, how does he get to all those people in one night?"
"He's a time traveler."
"Santa's the best damn time traveler of all time, little birdie."
So yeap, Merry Christmas.