The other 6 words
The Doctor: Don't challenge me, Harriet Jones. 'Cause I'm a completely new man. I could bring down your Government with a single word.
Harriet Jones: You're the most remarkable man I've ever met. But I don't think you're quite capable of that.
The Doctor: No, you're right. Not a single word.
[pause]
The Doctor: Just six.
Harriet Jones: I don't think so.
The Doctor: Six words.
Harriet Jones: Stop it!
The Doctor: Six.
[approaches Alex, whispering in his ear]
The Doctor: isn't it time you took charge?
The Doctor: Six.
[approaches Alex, whispering in his ear]
The Doctor: did you know she's a hooker?
The Doctor: Six.
[approaches Alex, whispering in his ear]
The Doctor: she needs help with her addiction