Previously my favorite unit quote was from the Changeling (Zealot) - "I'm looking for a cat, means the world to me."
But with LotV I think the Dark Archon's quotes beat it out - "Aldaris the betrayer - betrayed." and "Ulrezaj lives on, we feel his rage."
While not funny like the changeling's, these two great lines reference interesting parts of the lore. It's cool how the level where you get the Dark Archon in BroodWar was the one where you fight against Aldaris.
I think it's also worth noting that a million times in the campaign Amon's rage and anger is referred to. What does the Archon talk about regarding Ulrezaj? His rage.
Btw, was anyone else put off by how slow the Dark Archon spoke in LotV?