Quick: I need a nerdy joke in cartoon form!

As usual, xkcd delivers:

Alt text: "The worst resolution to the Valentine Prisoner's Dilemma when YOU decide not to give your partner a present but your PARTNER decides to testify against you in the armed robbery case."

Huh?

For the uninitiated, the Prisoners' Dilemma is a classic example of a two-player nonzero-sum game with a single pure Nash equilibrium. It is often posed in the form of a narrative where the players are two associates who have both been apprehended for a crime (armed robbery, apparently) and are being held and questions in separate prison cells. Each player has a choice of two actions: Betray your partner and testify against him and Cooperate and remain silent. The payoffs for these actions are usually prescribed so that the equilibrium action is where both players betray each other, and both end up serving long prison sentences.

Never thought of casting it in terms of Valentines Day, however :)

Stay out of jail,

Clay