I was making a random DW spoof video when my cracked-out brain found a second joke within the clip I was working with, courtesy of David Tennant's strange facial expressions. I took a screencap, and contemplated putting it in the video, but then decided to share it here instead.
I don't think anyone needs a spoiler warning for Christmas Invasion anymore, but behind a cut just in case.
Here's what the picture is referencing, so no one's left out:
http://www.youtube.com/watch?feature=player_embedded&v=aZdtZIuVzmE And here's the spoof thing I was working on, in case anyone was interested (even though like 3 other people beat me to this joke already):
http://www.youtube.com/watch?v=8Nv-3EquNnU