The Eleventh Doctor: Bow ties are cool.
The Tenth Doctor: Need this?
(offers the Fifth Doctor his sonic screwdriver)
The Fifth Doctor: No, I'm fine, thank you.
The Tenth Doctor: (sarcastic) Oh no, of course, you mostly went hands-free didn't you? It was like, "Hey, I'm the Doctor, I can save the universe using a kettle and some string! And look at me, I'm wearing a vegetable."
The Ninth Doctor: Fantastic!
(series 4 trailer)
Donna Noble: There are things waiting in the darkness. Creatures of metal, fire and blood. But he's out there, burning through time, facing a thousand dangers across the stars and never giving up. He looks like a man but he's a legend and his name is the Doctor. He'll come back to save us and this time I'm going to be ready. Then just like that...
Donna Noble, The Tenth Doctor: We'll be gone.
(series 1 trailer)
The Ninth Doctor: Do you wanna come with me? 'Cause if you do then I should warn you, you're gonna see all sorts of things. Ghosts from the past; Aliens from the future; the day the Earth died in a ball of flame; It won't be quiet, it won't be safe, and it won't be calm. But I'll tell you what it will be: the trip of a lifetime.
(series 3 trailer)
Martha Jones: I battle with textbooks.
The Tenth Doctor: I battle with monsters.
Martha Jones: I've tried to save money.
The Tenth Doctor: I've tried to save the universe.
Martha Jones: I'm going to be a doctor.
The Tenth Doctor: I *am* the Doctor.
Martha Jones: Well, let's hope this box is big enough for the both of us.
The Tenth Doctor: ...The Master, He just showed up again, the same as ever
The Fifth Doctor: Oh no. Really? Does he still have that rubbish beard?
The Tenth Doctor: Well, he's got a wife...
The Tenth Doctor: I'm sorry. I'm so sorry.
The Ninth Doctor: Me? I am the Doctor.