What are the coolest computer viruses you know and why these are the coolest?
I like invisible viruses. Access to a person PC is cool while he/she does not know that I am able to look all the files and stuff on the PC.
I think the most coolest computer viruses are such what are beneficial for the virus author. Invisible crypto miners are really cool.
Personally, I find most interesting, for example this: 2011 PlayStation Network outage - Wikipedia