I'm sorry for spamming my flist again tonight.
It's just... I'm Star Wars fan and this thing I've noticed in EoT2...

(spoilers if you haven't seen End of Time, part 2)

( Koona t'chuta, Solo? )

Haha! Just watched part 2 of End of Time.

( I am a genius )

Why does everyone think it will be the Master that will knock four times? It's not that obvious (or is it?) and I think the Doctor (and the Master) will be facing something bigger.

If I'm wrong, and it will be the Master that "knocks four times", I will eat my sock.