The Great CFC Avatar Switch
The Great CFC Avatar Switch is an event that has occured every year on the week of April 1 since 2004 as an April Fool's Day Joke on unprepared newbies and pretty much everyone else. During the week, or sometimes just the day, the posters participating in the switch take another posters' Avatar, and in most cases, the Signature, User Title, and Location. Some posters also take on the personality and posting style of the one they copy to further confuse everyone.
According to a plot-forwarding hooded figure taillesskangaru met in Tajikistan, the tradition started as a natural instinct of the CFC'ers to throw off the avatars' influence and prevent them from taking control of their souls like what happened a long time ago. Or something like that.