Cavil is terrific in that regard, that's true. Two other scenes that come to mind:
- One Cavil is proclaiming he's not a Cylon until he seems himself, becomes quiet and just goes: "Oh, well, okay then."
- Cavil and the other Cylons come aboard Galactica with Baltar and Cavil offers to "...throw in Baltar". When D'Ana calls him on it, he responds that he's improvising.