I like this one
Having a keen interest in virus' back in the 90s in college, they always fascinated me.
The first virus I managed to get on floppy was the Form virus. Used to mess around in a hex editor looking for the messages that it never displayed. Can't remember what they said now. Always infected the boot sector.
Found it
"The FORM-Virus sends greetings to everyone who's reading this text. FORM doesn't destroy data! Don't panic! Fuckings go to Corinne."