Blogger at U-SUKE's tumblr says [ja] he learnt the art of diplomacy from a former mobster.
This the yakuza's advice: “During negotiations, you know, the one who looses his temper looses the game. First of all you listen carefully to what the other party has to say. Then, when he utters the word he shouldn't have uttered, you cling to that word and immediately follow up.”