MASTER: Ah, Doctor! Look at us! Two brilliant minds! We make such a great team together! Why did it have to sour so badly? What set us so far apart?
DOCTOR: You went mad, remember?
MASTER: Oh yes! Thats right.
If youre a Doctor Who fan and in particular if youre a fan not just of the revived 2005 version but of the original classic series as well (because otherwise youre not going to get a lot of the references) then I highly recommend Rich Morriss fan comic The Ten Doctors, which brings together the Doctors first ten incarnations (as well as just about every supporting character you can think of) and does a very nice job of capturing the distinctive voice of each one.
You can read it online or download it in various formats.
(Dont skip the deleted scenes in the Appendix! I particularly like the one with Leela and the Valeyard, which I would have been happy to see left in.)