Tit-for-tat in the iterated Prisoner's Dilemma, specifically. It also poses the question: how good a strategy is it to combine humor with mortal threats?
It looked to me like a perfect, textbook example of a Schelling-type Threat; but maybe that's just because I'm reading The Strategy of Conflict.
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.