Not if this bit of conversation that takes place right before the Doctor and Romana are about to land on Atrios. They find that the planet is under nuclear attack and Romana fears the worst.
Doctor: Think positive. Why do you always assume the worst?
Romana: Because it usually happens.
Doctor: Empirical poppycock! Where is your joy in life? Where’s your optimism?
Romana: It opted out.
K-9: Optimism. Belief that everything will work out well. Irrational, bordering on insane.
Doctor: Oh, do shut up K-9. Listen Romana whenever you go into a new situation you must always believe the best until you find out exactly what the situation is all about then believe the worst?
Romana: Ah, but what if it turns out not to be the worst after all?
Doctor: Don’t be ridiculous, it always is. Isn’t it K-9?