It still amuses me that that the only time I've had an encounter with a virus was when I was working for my Uni. Infected my work PC. All the security and virus scanners didn't make a bit of difference - the worm originated internally and there was no security against internal attacks
Carry on Screaming - when they're barricading the door but the monster has smashed through the wall and is lending them a hand with the barricade
Every other PC in the open access labs had spyware and adware of some sort - technicians were just fire fighting.