The majority of your knowledge of European geography comes from Diplomacy, you ignorant North American. =)
When you suddenly realize that maybe all the world's diplomats have the same mindset as Diplomacy players, and you sink into despair, knowing that if this is true, there will always be war, until someone captures 18 supply centres.
You dream of convincing France and Italy to convoy your Turkish army all the way to the English Isles in a sneak cross-Europe stab, in which England has no hope for retribution. =D
You won't vacation in Spain, Bulgaria, or St. Petersburg, until the updated adjudicator is up in running, lest you be stuck there and forced to disband.
Your ultimate sexual fantasy involves a Diplomacy game that lasts until the current year.
You start to "bounce" people in real life, like when you're in line, or you're going for the last piece of pizza, or when you see another guy going for the girl you like.
But the true badge of a Dip player, is when you receive death threats from someone you've just stabbed, and you don't dismiss these as your run of the mill death threats, oh no, you take them very, very, seriously... You hire a bodyguard, install new locks, get yourself a handgun, and even limit your time spent out of your safehouse. But all the while, still playing the game to win. =)