No, not the sicknesses, computer viruses. When I was young and we were first playing with programming we use to write joke viruses to flex our skills. When I say joke I mean joke viruses, harmless but annoying. So anyway, I was thinking of something funny to do and got a great idea for one, back then photos were not stored on computers except by the few geeks I knew so I haven't done this yet. Make one which inverses all the colors on every photo in someones computer. With the new processors you wouldn't notice while it's happening unless it hit a photo you are just now opening! It would be fun to watch their expressions and so easy to reverse.