Hmm. In my experience, it goes something like:
NNES: You have two cows. It's a pain to take care of them. You kill them out of spite.
JNES: You have two cows. They're easily the best cows around from day one, however, they get bored of living and die.
DasNES: You have two cows. They are on opposite sides of the spectrum of politics and constantly war, until one goes socialist and leads a revolution. The two cows again go to war over government systems, and eventually both are killed by nuclear missiles.
XenNES: You have two cows. They're actually quite good cows, except their mooing is often incoherent. They die randomly in the middle of producing more milk.
CapNES: You have two cows. They are apparently trying their best to make peace with a third cow, but it all falls through, and they suddenly go to war over the third cow's milk. The third cow walks away, unnoticed.
KamNES: You have two cows. Quite good cows, actually, and they produce a lot of milk--but then they mysteriously dissapear, only to turn up years later, producing milk again.
AzaleNES: You have two cows, which are quite superb. But then, without warning, they drop dead, and are replaced by completely different, but still superb cows.
ErezNES: You have two cows. They are actually good cows, but they are far too modest and say they are the suckiest cows on the planet.