The Sound Off example on the main page can be heard when you build a Network Node at one of your bases.
"I don't know but I been told! (I don't know but I been told!) Deirdre's got a Network Node! (Deirdre's got a Network Node!) Likes to press on the on-off switch! (Likes to press on the on-off switch!) Dig that crazy Gaianwitch! (Dig that crazy Gaian witch!)
Sometimes, faction leaders (especially the ones who are neither particularly peaceful nor particularly aggressive) have trouble making up their minds about whether they want a Pact of Brotherhood or not. It can be amusing when Zakharov declares he's had enough of your ecological ramblings/paranoid delusions/pacifistic whining/whatever else your faction leans towards and breaks his pact with you, but is perfectly happy to remake it with no strings attached the very next turn. "Randomize Faction Leader Social Agendas", which replaces each faction's preferred form of social engineering with a random one. Sometimes the results are surprisingly reasonable, such as the Morganites valuing Wealth, but you also get odd cases like the militaristic Spartans wanting you to run a Democracy or the normally anti-scientific Believers demanding that you pursue Knowledge.
Turning down a request from a human (usually for a loan or tech) when you're playing as one of the Progenitor factions will occasionally be phrased as "Human idiom: liar liar pants on fire." There's something distinctly amusing about the powerful, aloof aliens having the tact of an elementary school child.