A little typo in a GLine caused major effects on the Undernet network today.
The result of the typo was that the entire network got GLined with the reason set for the user the GLine was meant for: infected! Advertising infecting web sites. Clean this computer! http://www.moosoft.com http://housecall.trendmicro.com/ )
As a result of the events the entire network fell apart, and servers had to be reconnected one-by-one. On the IRC statistics website NetSplit.de Undernet dissapeared completely from the Top 25 list, where it normally can be found in the top 3.
The error was a combination of a cut&paste error and a never before seen bug in the services an Undernet admin told IRC-Junkie in a reaction.
Maybe one good thing came out of this however, as many people might have checked their computers for malware!