Deciding to play nice and peacefully, having the AI mistake my huge economy and small though modern army for a pushover, giving him a couple of chances to reform, and then when he re-declares war for the third or fourth time,
STOMPING HIS PATHETIC CULTURE, STATE, AND ARMY INTO THE DIRT AND LEAVING HIM BLEEDING AND CRYING OUT "MAMA, MAMA" AND TURNING HIS ENTIRE POPULATION INTO SLAVE WORKERS.
And then returning to my peaceful developmental ways.
Genocide is MUCH more fun when the victims have it coming.