Fourth Doctor: "A new body is like a new house: it takes a little bit of time to settle in. (He gasps as he looks in a mirror). As for the physiognomy... Well, nothing's perfect!"
(Robot)

Fourth Doctor: "I claim the presidency of the Council of Time Lords!"
(Invasion of Time)

Fourth Doctor: "There you are, so sorry."
(Stones of Blood)

Fourth Doctor: "Before you do anything rash, like pressing another button, may I make an alternative suggestion?"
(Revenge of the Cybermen)

4th Dr.- Some of my best friends are humans. 
(The Invisible Enemy, 15Kb)

4th Dr.- Should we try using our intelligence? 
Leela- Well, if you think that's a good idea. 
(The Invisible Enemy, 33Kb)

4th Dr.- That's the trouble with computers. No IMAGINATION!!! 
(The Invisible Enemy, 33Kb)

4th Dr.- Ha, ha, ha, hah! Yes! YES!!! 
(The Invisible Enemy, 65Kb)

4th Dr.- I'VE HEARD IT ALL BEFORE ! ! ! You megalomaniacs are all the same. 
(The Invisible Enemy, 40Kb)