I won a game of Diplomacy. It's the third game that I've started, and the first that I've finished. I also did it without lying very much. (E.g. the only time that I said I would do something and then didn't, was when I didn't know whether the person I was talking to had got my message on time; and I don't think they minded, because we'd teamed up against another player and the effect of me doing this was that I took more from that player than I would have otherwise.)

Cooler than that was coming joint first in the IPD tournament