Lando Calrissian: Lord Vader, what about Leia and the Wookiee?

Darth Vader: They must never again leave this city.

Lando Calrissian: That was never a condition of our agreement, nor was giving Han to this bounty hunter!

Darth Vader: Perhaps you think you're being treated unfairly?

Lando Calrissian: No.

Darth Vader: Good, it would be unfortunate if I have to leave a garrison here.

The Empire Strikes Back, via WikiQuote.