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."

I had to smile, because I knew that USB sticks are a typical spreading method of Conficker.

Another handful of notable worms:

- Sobig.F, August 2003 https://en.wikipedia.org/wiki/Sobig

- WANK, 1989 https://en.wikipedia.org/wiki/WANK_(computer_worm)

- mydoom, January 2004 https://en.wikipedia.org/wiki/Mydoom

- ILOVEYOU, May 2000 https://en.wikipedia.org/wiki/ILOVEYOU