Where do mice come from?!

I do not know what is wrong with me, the past 2 days I have been seeing mouses (is it "mice" in english?) everywhere!

Where do all those come from? How come they multiply in such numbers?

September 22, 2008

During the maintenance period on Tuesday, September 23, between 10:00 AM and 12:00 PM Central Time (3:00 PM to 5:00 PM GMT), the following changes will be made:

Account Services

• All account service requests that were applied before today's maintenance will be executed today.

Events

• The Great Mouse Hunt event will be implemented during this maintenance window. Romantic music, chocolates and specially equipped dens will be provided to all participating mobs.
  

Detail from the noob comic