b997eee8_CCG___What_s_That_Inside_Joke___In_joke
[Card] Jack Harkness - No Coward [Exp.] 9D [Type] Ref [In-joke] 
Though the subtitle comes from a line in "The Parting of the Ways", it can also be taken as one to his nude scene.
Unauthorized Dr. Who CCG - What's That Inside Joke?
In-joke