Via Bruce Sterling:
Bagle and NetSky are fighting with each other. In NetSky.F, researchers found the following text: “Skynet AntiVirus – Bagle – you are a looser!!!!” This NetSky worm variant tries to remove Bagle worm infection if it finds it on an infected computer. And in Bagle.K, a message is embedded saying, “Hey, NetSky, f*ck off you b*tch!”