Watching those exapansion cities that Babylon and America had put up defecting to me.
Having a war in a Democratic government with the Infinity City Sprawl's effects. One Temple per city coupled with just a few luxuries, and you can almost forget about any war weariness.
Watching a Jaguar Warrior attack my Mech Infantry.
Bombarding an enemy civs countryside to death with Battleships, Bombers, and Artillery on the very first turn of war.
Isolating a lone civ, signing MPPs with everyone else, then going straight to an embargo. Then, watching Gandhi nashing his teeth in fury and sending his pathetic War Elephants against my Infantry. Then, watching Germany, China, and America pummel India into non-existence. Then, seeing their conquered cities defecting to me after having lost all their culture buildings.
Ahh. . . life is good with Civ.