I've only listened to part of the "Behind the Scenes" stuff. I'm glad they did, because it really is one of the running jokes through series 4. Not to mention, "the lady doth protest too much, mehinks!"

Oh, I am absolutely sure they had the best time, and yes, I'm sure that DT at the very least was jumping all over the studio booth. He's known for his performance energy. I believe that Krysten Ritter commented that when he was called on set, he would run in eagerly.