Whenever you copy and paste somebodys text from one AIM conversation to another and your font changes to the copied font.
Stratomaster: i just copyed and pasted that disease name from ryan
Stratomaster: and apparently
Stratomaster: im immune to fontitis
When you're typing on AIM and copy something another person says, then you go to type, and you have picked up their font. One of the most annoying and deadly things to occur on the internet.
Ah, jeez Vicki, I got fontitis.