I used to have a casual girlfriend like this -- she'd get a couple of wine coolers in her and all of a sudden, "my ex-boyfriend called me today -- he asked me if I wanted to hang out." I never took the bait because I knew what she was doing, and like I said, it was casual and she was just a stopgap between real girlfriends, but apparently, this is nothing new -- isn't that right, Emily? --@Fancylad

An excerpt from Geo:

Female vervet monkeys manipulate males into fighting battles by lavishing attention on brave soldiers while giving noncombatants the cold shoulder, researchers said Wednesday.

As in humans, it turns out, social incentives can be just as big a driver for male monkeys to go to war as the resources they stand to gain from fighting, whether it be territory or food.

"Ours is the first study to demonstrate that any non-human species use manipulative tactics, such as punishment or rewards, to promote participation in intergroup fights," study co-author Jean Arseneau, a primate specialist of the University of Zurich, told AFP.