Star Trek: The Next Generation1987

[a welcoming party is preparing to meet mediator Riva on his planet]

Counselor Deanna Troi:
Have your sensors indicated any problem down there, Lieutenant?

Lieutenant Worf:
None.

Counselor Deanna Troi:
But you're feeling a certain confusion about this mission.

Lieutenant Worf:
No.

Counselor Deanna Troi:
Yes! I've never known you to have such strong emotions, except when you're expecting to do battle.

Lieutenant Worf:
I am not expecting battle.

Commander William T. Riker:
Then what is bothering you?

Lieutenant Worf:
[taking a moment] Riva.

Captain Jean-Luc Picard:
Ah. Riva negotiated several treaties between the Klingons and the Federation.

Lieutenant Worf:
Before him, there was no Klingon word for '*peace*-maker'.