Star Trek: Deep Space Nine1993

Lieutenant Jadzia Dax:
The Korvat colony. First day of negotiations, I walked out on you - right in the middle of that long-winded speech of yours. You should have seen the look on your face. Nobody had ever had the kajunpak't to show their back to the great Kang before Curzon did.

Kang:
I almost killed Curzon that day.

Lieutenant Jadzia Dax:
I knew, I had to get you very, very angry, or my mission wouldn't succeed. Getting you angry with me was the only way to begin to create a bond between us.

Kang:
Curzon understood Klingons.

Lieutenant Jadzia Dax:
And he also understood what he was doing when he took a Klingon blood oath.