I just love the Spathi from Star Control. Their such a fun race to interact with.
If you have a normal conversation with them their is a chance they will simply surrender to you even if you just park your ship above their planet first they will bluff, Then they will compromise, then follow by complete surrender even if your not really asking for it.
https://www.youtube.com/watch?v=LEZ75L36m74
https://www.youtube.com/watch?v=Rdsa5vrOLnI
https://www.youtube.com/watch?v=r4s9pUayx8I
https://www.youtube.com/watch?v=afuWQonf4D8
https://www.youtube.com/watch?v=WPUC-qS4c0s
https://www.youtube.com/watch?v=STcAhhcqXpU