SLAVER: What about the dwarf?

MALKO: Worthless. Cut his throat.

TYRION (The Dwarf): Wait, wait! Wait, wait, wait, let’s discuss this!

MALKO: And then chop off his cock. We can sell it for a fortune. A dwarf’s cock has magic powers.

TYRION: Wait, wait, wait, wait! You can’t just hand a dried cock to a merchant and expect him to pay for it. He has to know it came from a dwarf. And how could he know unless he sees the dwarf?

SLAVER: It will be a dwarf-sized cock.

TYRION: Guess again.

MALKO: The dwarf lives until we find a cock merchant.

From Game of Thrones

This relates to rationality because TYRION, in a moment of great stress, finds a convincing argument whose premise must have been repugnant to himself, analogous to a green tribe member quickly locating an argument that he finds detestable but blues find convincing.