Security experts have discovered that some of the viruses going around are simply virus writers trying to insult each-other or one-up rival virus authors. There are some 20 different types of Mydoom, Netsky and Bagle viruses traveling through the web and many contain insults directed at other viruses. For example, the code inside the Netsky virus said, "Bagle - you are a looser!!!!". It certainly makes it appear that many of the virus writers are very young.
