When I was doing my military service (about 5 years ago) an officer handed me a USB stick. I was supposed to digitize a few printed tables in Excel and save them to the stick. When I plugged it in, the antivirus, which hadn't been updated for years, immediately popped up. Conficker was found. The officer simply said, "Ignore it. Just click the window away."<p>I had to smile, because I knew that USB sticks are a typical spreading method of Conficker.